用括号内所给单词的适当形式填空。

He ________ a singing star when she was 21 years old．(become)

用括号内所给单词的适当形式填空。

Many windows ________ in the wind yesterday．(break)

用括号内所给单词的适当形式填空。

He saved a lot of people's ________(life)．

用括号内所给单词的适当形式填空。

________ of years ago，people ate raw meat．(million)

用括号内所给单词的适当形式填空。

There ________ a fire-drill tomorrow．(be)

用括号内所给单词的适当形式填空。

I have to help ________ when nobody can help me．(I)

用括号内所给单词的适当形式填空。

Early men used fire for ________ them warm．(keep)

用括号内所给单词的适当形式填空。

A group of ________ put out the fire．(fireman)

用括号内所给单词的适当形式填空。

We want to get ________ information about it so that we can do a better one．(much)

用括号内所给单词的适当形式填空。

Men started eating ________ food after they could make a fire．(cook)