Which of these are complete sentences? Check all that apply.

The date of the Chinese New Year is determined by a lunisolar calendar.
A lunisolar calendar shows the moon phase and the solar time of year.
Usually on the second new moon after the winter solstice.
A public holiday in many countries with large Chinese populations.
It is traditional to light fireworks on the first day of the celebration.
Due to concerns about fire hazards, some regions have banned fireworks.

The date of the Chinese New Year is determined by a lunisolar calendar.

A lunisolar calendar shows the moon phase and the solar time of year.
A public holiday in many countries with large Chinese populations.
It is traditional to light fireworks on the first day of the celebration.
Due to concerns about fire hazards, some regions have banned fireworks.

To identify which of these are complete sentences, you need to check for two main criteria. A complete sentence should have a subject (who or what the sentence is about) and a predicate (what the subject is doing or what is being said about the subject).

Let's analyze each option to determine if it meets this criteria:

1. "The date of the Chinese New Year is determined by a lunisolar calendar." This is a complete sentence because it has a subject ("The date of the Chinese New Year") and a predicate ("is determined by a lunisolar calendar").

2. "A lunisolar calendar shows the moon phase and the solar time of year." This is a complete sentence because it has a subject ("A lunisolar calendar") and a predicate ("shows the moon phase and the solar time of year").

3. "Usually on the second new moon after the winter solstice." This is not a complete sentence. It lacks a subject. It is just a prepositional phrase that doesn't express a complete thought.

4. "A public holiday in many countries with large Chinese populations." This is not a complete sentence. It also lacks a subject and is similarly just a noun phrase.

5. "It is traditional to light fireworks on the first day of the celebration." This is a complete sentence. The subject is "It" (referring to the Chinese New Year celebration) and the predicate is "is traditional to light fireworks on the first day of the celebration."

6. "Due to concerns about fire hazards, some regions have banned fireworks." This is another complete sentence. The subject is "some regions" and the predicate is "have banned fireworks."

Therefore, the complete sentences in the given options are:
- The date of the Chinese New Year is determined by a lunisolar calendar.
- A lunisolar calendar shows the moon phase and the solar time of year.
- It is traditional to light fireworks on the first day of the celebration.
- Due to concerns about fire hazards, some regions have banned fireworks.

The complete sentences are:

1. The date of the Chinese New Year is determined by a lunisolar calendar.
2. A lunisolar calendar shows the moon phase and the solar time of year.
3. A public holiday in many countries with large Chinese populations.
4. It is traditional to light fireworks on the first day of the celebration.
5. Due to concerns about fire hazards, some regions have banned fireworks.