Ⅰ.单句语法填空
1．It must have rained last night, ________ the ground is wet.
2．At the sight of his ________ (appear) on the stage, the hall rang with thunderous applause.
3．In many people's opinion，that company, though relatively small, is pleasant ________ (deal) with.
4．The experiment shows that proper amounts of exercise, if ________ (carry) out regularly, can improve our health.
5．When I left the company, a cleaner was still there, ________ (mop) the floor.
6．The computer can ________ (program) to consider certain facts which are stored in memory and then come to a decision.
7．Obviously, what worries most parents is how easy it is for children ________ (download) images on the Internet.
8．He stood up, ________ (signal) to the officer that he had finished with his lawyer.
9．I can't go out today. The boss has some letters ________ (type)．
10．In recent years, many difficulties ________ (arise) as a result of the change over to a new type of fuel.
