一.用正确形式填空1.The space shuttle ________(not return) from a vis

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一.用正确形式填空
1.The space shuttle ________(not return) from a visit to the space station yet.
2.________scientists ________(discover)water on Mars yet?
3.Scientists _________already _________(find)there's no life on the Moon.
二.句型转换
1.Astronauts went to the Moon (by spacecraft).(就括号部分提问）
_______ ______ astronauts ______ to the moon?
2.I haven't heard about the story yet.(改为肯定句）
I _______ ________ heard about the story.
3.I think there is life out there in space.(改为否定句）
I ________ _______ ________ life out there in sapce.
4.Astronauts have been to the Moon (several) times.(就括号部分提问）
_______ _________ times ________astronauts been to the Moon?

has not returned
have,discovered
have,found
how did,go
i have
think there isn't
how many,have

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