动词填空 （本大题共10分，每小题1分）用括号内所给动词的适当形式填空。

小题1: ---Is Lucy still sleeping?

---No, Mum _________________ (wake) her up.

-小题2:-- What do you think of the story?

--- It’s great! I ___________________ (read) it again.

小题3:After Sam finished the letter, he sat there silently, ______________(not know) what to do next.

小题4:Lei Feng always did what he could _______________ (help) people in need.

小题5:They will come to see him if it ____________ (not be) rainy tomorrow.

小题6:We ____________ (enjoy) our trip very much. It was great fun!

小题7:John couldn’t stop ______________ (laugh) when he heard the joke.

小题8:There _______________ (be) great changes in Wuxi in the past few years.

将煤堆放在墙角多年，发现涂墙的石灰层内很深处都变黑了，这是现象，它说明组成物质的分子______