--- How long have you ________ the basketball team of the school?

--- About two years.

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--- Have you finished ________ the words yet?

--- Yes, I ________.

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--- Ann has gone to Shanghai.

--- So ________ her parents.

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________ our eyes, we can see more than ________ stars at night.

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I don't think the book is useful, ________?

[　　]

However, no one ________ any life in space yet.

[　　]

It was said that some spacecraft have gone ________ the solar system.

[　　]

It is hard ________ his strange idea.

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