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。
---Is Lucy still sleeping?
---No, Mum _________________ (wake) her up.
--- What do you think of the story?
--- It’s great! I ___________________ (read) it again.
After Sam finished the letter, he sat there silently, ______________(not know) what to do next.
Lei Feng always did what he could _______________ (help) people in need.
They will come to see him if it ____________ (not be) rainy tomorrow.
We ____________ (enjoy) our trip very much. It was great fun!
John couldn’t stop ______________ (laugh) when he heard the joke.
There _______________ (be) great changes in Wuxi in the past few years.