题目内容：

单句改错

每句有一处错误，请按以下要求改错：

错误：把某词改为某词。写为：某词---某词。例如: was--were

增加：在某词后加某词。写为：某词后加某词。例如：by后加the

删除：去掉多余的词。写为：去掉某词。例如：去掉a

1.They are looking forward to visit China again.

2.The little boy is at his computer, playing computer games, as if having a great fun.

3. He had promised that he’d have a word with me about my work, but he did not keep his words.

4. When he climbed to the top of the mountain,  he was out of his breath.

5.When we were young, every evening my brothers and I will stay at home waiting for our mother.

6.Weather permitted, we’ll go out to climb the hill.

7.I’m sorry to have put you to trouble of changing a large note for me.

8. From space, the earth looks like blue. This is why about 71 % of its surface is covered by water.

9.We shall have studied last night, but we went to the concert instead.

10. With time gone by, his memory seems to get worse and he often forgets what subject is discussed at present.