但是之后，风力会逐渐减弱。

But the wind will________ ________later on．

他们那时正在购物。

They________ ________at that time．

天下雨时，你在干什么呢?

What________you________while it________ ________?

当他走进一家纪念品商店时，我很吃惊。

I was very________when he________ ________a souvenir shop．

你给我打电话时，我正站在图书馆的前面。

I________ ________in front of the library when you________ ________．

昨天晚上我妈妈很快就睡着了。

My mother________ ________soon last night．

（2014广东）Most people are________building a paper factory near here．They are worried the river will get polluted．

A．for

B．with

C．against

D．beyond

Yesterday evening I was playing the piano________the doorbell rang．

A．when

B．before

C．while

Tony________TV when his mother came in．

A．watch

B．watches

C．was watching

D．is watching

（2013天津）I saw him in the library yesterday．He________a book at that moment．

A．reads

B．is reading

C．was reading

D．will read