题目内容：

高一英语单句改错...
1.He succeed in the competition made each of us happy.
2.The problem is more and more young people are getting into the habit of smoking.
3.If he is an engineer is unkown.
4.What she wants to know is if she should attend the conference.
5.At the meeting he raised a question if the project would be concelled.
6.It depends on if it's going to rain.
7.We expressed the hope which the Browns would come to China again.
8.The reason why he failed in the exam was became he was too careless.
9.No matter who comes to visit the exhibition is welcome.
10.What he needs are enough time and what i need is enough books.