9.What if he doesn't come tomorrow?

解析：考查句型。句意：如果他明天不来，我们怎么办呢？what if如果......将会怎么样；如果......又怎样，询问将来可能发生的事或面临的情况，特别是不太好的情况。

10.In fact, he handed in/over the paper covered(cover) in writing.

解析：考查副词以及非谓语动词。句意：他把写满字的纸递过来。hand over把......递过来；hand in上交；covered是过去分词作定语，相当于which was covered。

Ⅱ.单句改错

1.While a dog, he happened to meet an old friend.

解析：考查非谓语动词。句意：在遛狗时，他碰巧遇到了一位老朋友。While doing...现在分词作状语，强调walk与句子主语he之间是主谓关系。

2.Once by the teacher, the child will become a good one.

解析：考查非谓语动词。句意：一旦由老师来教育，这个小孩会变得很乖的。Once taught 相当于once he is taught,过去分词作状语，强调teach与句子主语the child之间是被动关系。

3.Every time he opens his mouth,he will betray as an American.

解析：考查代词。句意：每次他一张嘴就会暴露是个美国人的身份。betray oneself暴露身份。

4.In of weather, the city of Sanya is a good place for tour.

解析：考查介词短语。句意：从天气来讲，三亚市是一个旅游胜地。in terms of就......来说；从......角度看。

5.What do you take me ?A thief ?

解析：考查介词。句意：你把我当成什么人？小偷？take...for...把......误认为是......。

6.It's rude to make remarks the appearance of others.

解析：考查介词。句意：评论他人的相貌是不礼貌的。make a remark/remarks on 就......发表意见，对......作出评论。

7.While having breakfast, Lee went through all the ads in the newspaper, hoping to