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根据下列文章回答 21～25 题：
第 21 题 Details of the private life of an astronaut are hard to come by，because they are__________．

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can be used to heat your water at home instead of so much gas or electricity？__________

It' s cold outside. You' d better__________your coat.

The doctor suggested more exercise.

How many languages do the people in India speak？