Place a comma where necessary and a semicolon where necessary.

1) I will not buy that that carp it is far too expensive.
2) He still cannot use Word consequently, Tara must stay here.
3) I noticed the baker, Ian, jogging in the park every day but he never seemed to get any slimmer.
4) The expedition will include Dr Evans the senior medical officer Alan Marks the team leader Martin Dodds and Simon Dodds (not related) the base-camp commanders and Jane Lothian the expedition botanist.
5) Robert went to the show, he bought a lot of new cards.
6) If Mary runs in the race, she will certainly win.
7) The school year is already too long, we do not need to add days.
8) Snow is beautiful to watch, it seems so peaceful .
9) You should check the oil in your car, proper maintenance will make the
car last much longer.
10) Robert went to the show and he bought a lot of new cards.
11) I studied for six hours for the test but I did not feel confident.
12) You can buy a new house, or you can save money with a "handy
man's special."
13) She went to the store and bought several items on sale.
14) Oscar was not hurt in the accident so he felt very fortunate.
15) Janie liked eggs however she did not like them for breakfast.

Someone here will be happy to check your answers.

http://grammar.ccc.commnet.edu/grammar/commas.htm

http://grammar.ccc.commnet.edu/grammar/marks/semicolon.htm

1) I will not buy that carp; it is far too expensive.

Explanation: Use a semicolon to separate two independent clauses that are closely related.

2) He still cannot use Word; consequently, Tara must stay here.
Explanation: Use a semicolon to separate two independent clauses, and use a comma before a conjunctive adverb like "consequently" when it begins a new independent clause.

3) I noticed the baker, Ian, jogging in the park every day, but he never seemed to get any slimmer.
Explanation: Use a comma before a coordinating conjunction (in this case, "but") to separate two independent clauses, and use commas to set off nonessential information like the name "Ian" in this sentence.

4) The expedition will include Dr Evans, the senior medical officer; Alan Marks, the team leader; Martin Dodds and Simon Dodds (not related), the base-camp commanders; and Jane Lothian, the expedition botanist.
Explanation: Use commas to separate items in a list, and use a semicolon before the final item in a list when the items themselves contain commas.

5) Robert went to the show, and he bought a lot of new cards.
Explanation: Use a comma before a coordinating conjunction (in this case, "and") to separate two independent clauses.

6) If Mary runs in the race, she will certainly win.
Explanation: No additional punctuation is needed in this sentence.

7) The school year is already too long; we do not need to add days.
Explanation: Use a semicolon to separate two independent clauses that are closely related.

8) Snow is beautiful to watch, and it seems so peaceful.
Explanation: Use a comma before a coordinating conjunction (in this case, "and") to separate two independent clauses.

9) You should check the oil in your car; proper maintenance will make the car last much longer.
Explanation: Use a semicolon to separate two independent clauses that are closely related.

10) Robert went to the show, and he bought a lot of new cards.
Explanation: Use a comma before a coordinating conjunction (in this case, "and") to separate two independent clauses.

11) I studied for six hours for the test, but I did not feel confident.
Explanation: Use a comma before a coordinating conjunction (in this case, "but") to separate two independent clauses.

12) You can buy a new house, or you can save money with a "handy man's special."
Explanation: Use a comma before a coordinating conjunction (in this case, "or") to separate two independent clauses.

13) She went to the store, and she bought several items on sale.
Explanation: Use a comma before a coordinating conjunction (in this case, "and") to separate two independent clauses.

14) Oscar was not hurt in the accident, so he felt very fortunate.
Explanation: Use a comma before a coordinating conjunction (in this case, "so") to separate two independent clauses.

15) Janie liked eggs; however, she did not like them for breakfast.
Explanation: Use a semicolon to separate two independent clauses, and use a comma after introductory words like "however."