A. It B. As C. That D. What

12. ________ is known to all, China will be an ________ and powerful country in 20 or 30 years' time.

A. That; advancing B. This; advanced C. As; advanced D. It; advancing

13. He doesn't believe ________things ________ you do.

A. the same; as B. the same; with C. as same; as D. as same; with

14. ________ is mentioned above, the number of the students in senior high schools is increasing.

A. Which B. As C. That D. It

Key: 1-5 DACAD 6-10 CCBBC 11-14 BCAB

5.

生活中什么事都可能会"发生(happen)"。那么，你知道怎样使用happen这个词吗?下面我们就对happen的用法作一小结。

happen是不及物动词，它的用法常见的有如下几种情况：

1. 表示"某地(某时)发生了什么事"，常用"sth.+ happen +地点/时间"这一结构来表达，此时主语应是事情。例如：

The story happened in 2003. 这个故事发生在2003年。

An accident happened in that street. 那条街上发生了一起事故。

2. 表示"某人出了某事(常指不好的事)"，要用"sth.+ happen+to sb."这一结构来表达。例如：

A car accident happened to her this morning. 今天上午她发生了交通事故。

What happened to you? 你怎么啦?

3. 表示"某人碰巧做某事"，要用"sb.+ happen+ to do sth."这一结构来表达。例如：

I happened to meet a friend of mine in the street yesterday. 昨天我碰巧在街上遇到了我的一个朋友。

4. happen表示"碰巧或恰巧发生某事"时，还可用"It happens / happened that..."这一结构来表达。例如：

It happened that Brian and Peter were at home that day. 碰巧那天布莱恩和彼得在家了。

It happened that he had to take part in a meeting that afternoon. 碰巧那天下午他不得不参加一个会议。

注：that从句中的主语是人时，此种结构可以与"sb.+ happen + to do sth."结构互换。例如：

It happened that Brian and Peter were at home that day. = Brian and Peter happened to be at home that day.