Are these answers correct?

Punctuation within Sentences—Colon
1. The book had three different features: a hard-bound cover, a ribbon for a bookmark, and the author’s signature.
Punctuation within Sentences—Colon
2. German grammar is simple: In that language, there are no exceptions to the rules.
Punctuation within Sentences—Colon
3. Her daughter went on a diet that consisted of a variety of fast foods: hamburgers, hot dogs, French fries, ect.
Punctuation within Sentences—Colon
4. The list that the little boy handed to Santa consisted of a truck, a train, and a million dollars.
Punctuation within Sentences—Dash
5. Her mind flew so quickly—she forgot to stop at the light because she had so much to remember.
Punctuation within Sentences—Dash
6. The gardener took the and the shovel—and began to plant the flowers.
Punctuation within Sentences—Hyphen
7. You will need to write both short- and long-term goals.
Punctuation within Sentences—Hyphen
8. The president-elect of the Rotary Club had the winning lottery ticket.
Punctuation within Sentences—Hyphen
9. One-half of the student body attended the football game.
Punctuation within Sentences—Hyphen
10. The ill-defined terms somehow were not clear to her.
Punctuation within Sentences—Parentheses
11. The police officer checked her rear-view mirror when she heard the screeching tires. (Someone had rear-ended her the night before).
Punctuation within Sentences—Parentheses
12. You should be able to complete your program in two (2) years.
Punctuation within Sentences—Parentheses
13. The textbook had recently been revised. (The last revision took place in 1992.)
Punctuation within Sentences—Square Brackets

Idk, but trying using Brainly. Brainly is similar to this, but better :)

If Brainly doesn't help, you might have to wing it unless there's a better source out there. Best of luck! >3

To verify if the answers provided are correct, we need to understand the rules for using punctuation within sentences.

1. Punctuation within Sentences - Colon:
A colon is used to introduce a list or to separate two independent clauses when the second clause explains or emphasizes the first.

The answer for sentence 2 is correct: "German grammar is simple: In that language, there are no exceptions to the rules." The colon is used to introduce the explanation of why German grammar is simple.

2. Punctuation within Sentences - Colon:
The answer for sentence 1 is correct: "The book had three different features: a hard-bound cover, a ribbon for a bookmark, and the author’s signature." The colon is used to introduce the list of different features of the book.

3. Punctuation within Sentences - Colon:
The answer for sentence 3 is incorrect: "Her daughter went on a diet that consisted of a variety of fast foods: hamburgers, hot dogs, French fries, ect." The correct punctuation in this case would be a comma instead of a colon. The sentence should be: "Her daughter went on a diet that consisted of a variety of fast foods, such as hamburgers, hot dogs, French fries, etc."

4. Punctuation within Sentences - Colon:
The answer for sentence 4 is correct: "The list that the little boy handed to Santa consisted of a truck, a train, and a million dollars." The colon is used to introduce the list of items in the boy's list.

5. Punctuation within Sentences - Dash:
A dash is used to indicate a sudden change in thought or to emphasize a certain part of a sentence.

The answer for sentence 5 is correct: "Her mind flew so quickly—she forgot to stop at the light because she had so much to remember." The dash is used to indicate a sudden change in thought.

6. Punctuation within Sentences - Dash:
The answer for sentence 6 is correct: "The gardener took the and the shovel—and began to plant the flowers." The dash is used to emphasize the action of the gardener beginning to plant the flowers.

7. Punctuation within Sentences - Hyphen:
A hyphen is used to join words or parts of words together and is also used in compound modifiers before a noun.

The answer for sentence 7 is correct: "You will need to write both short- and long-term goals." The hyphen is used to join the words "short" and "term" to form a compound modifier before the noun "goals."

8. Punctuation within Sentences - Hyphen:
The answer for sentence 8 is correct: "The president-elect of the Rotary Club had the winning lottery ticket." The hyphen is used to join the words "president" and "elect" to indicate the elected president of the Rotary Club.

9. Punctuation within Sentences - Hyphen:
The answer for sentence 9 is correct: "One-half of the student body attended the football game." The hyphen is used to join the words "one" and "half" to indicate a fraction.

10. Punctuation within Sentences - Hyphen:
The answer for sentence 10 is correct: "The ill-defined terms somehow were not clear to her." The hyphen is used to join the words "ill" and "defined" to form a compound modifier before the noun "terms."

11. Punctuation within Sentences - Parentheses:
Parentheses are used to enclose additional information or clarifications within a sentence.

The answer for sentence 11 is correct: "The police officer checked her rear-view mirror when she heard the screeching tires. (Someone had rear-ended her the night before)." The parentheses are used to enclose the additional information about what happened the night before.

12. Punctuation within Sentences - Parentheses:
The answer for sentence 12 is correct: "You should be able to complete your program in two (2) years." Parentheses are used to enclose the number "2" as an alternative way to represent "two."

13. Punctuation within Sentences - Parentheses:
The answer for sentence 13 is correct: "The textbook had recently been revised. (The last revision took place in 1992.)" Parentheses are used to enclose the additional information about when the last revision took place.

It seems that all the answers provided are correct except the one for sentence 3, where a comma should be used instead of a colon.