Viết lại câu : 1. A spacecraft is a vehicle. It is used for travel into space <which> 2. The International Space Station is a large spacecraft. It was launched in 2011 <which> 3. An astronomer is a scientist. An astronomer studies the sun, the moon and other planets <who> 4. The place has a microgravity environment. Astronauts live and conduct research there <where>
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Cách làm:

1. Đặt "which" ở cuối câu và chia động từ "be":
A spacecraft is a vehicle which is used for travel into space.

2. Đặt "which" ở cuối câu và chia động từ "be":
The International Space Station is a large spacecraft which was launched in 2011.

3. Đặt "who" ở cuối câu:
An astronomer is a scientist who studies the sun, the moon and other planets.

4. Đặt "where" ở cuối câu:
The place has a microgravity environment where astronauts live and conduct research.

Câu trả lời:
1. A spacecraft is a vehicle which is used for travel into space.
2. The International Space Station is a large spacecraft which was launched in 2011.
3. An astronomer is a scientist who studies the sun, the moon and other planets.
4. The place has a microgravity environment where astronauts live and conduct research.

5. In summary, a spacecraft is a vehicle used for space travel, the International Space Station is a large spacecraft launched in 2011, an astronomer is a scientist who studies celestial bodies, and a place with a microgravity environment is where astronauts live and conduct research.

4. The place has a microgravity environment. Astronauts live and conduct research there, where they can experience weightlessness similar to what they would feel in space.

3. An astronomer is a scientist. An astronomer studies the sun, the moon and other planets, who plays a crucial role in understanding the universe.

2. The International Space Station is a large spacecraft. It was launched in 2011, which makes it one of the most advanced space laboratories in the world.