3. whether or if

1) 　　 his words are true remains to be looked into.

2) The problem is 　　 they are in favor of our plan.

3) 　　 he had come to talk with me, I would have given him some advice.

2. that or which

1) He changed his mind without asking me for advice, 　　 really annoyed me.

2) You needn’t regret, because all 　　 can be done has been done.

3) This is the very book 　　 I am looking for from store to store.

4) Tom is no longer the boy 　　 I was familiar with years ago.

5) Knowing about the various ways in 　　 humans have affected the environment will help us understand the problems better.

二、明辨是非。

1. that or what

1) 　　 he really means is 　　 he will do　　 he can to help us.

2) 　　 we will go for an outing this weekend amuses every student in our class.

3) Is this the factory 　　 is charged with pouring polluted water into the river directly?

4) 　　 I was wondering about was 　　 I could do to prevent such things from happening again.

8. 谁将会被任命为销售部经理现在还是个秘密。

　 　 　　 　　 　　 　　 as the sales manager is a secret now.

7.　 我竟然错过了和你面谈的机会，真是遗憾。

　 　 　　 　　 　　 that I 　　 　　the chance to have a face-to-face talk with you.

6.　 提前告诉他们会议的日期是有必要的。

　 　 　　 　　 　　 that we 　　 　　 them of the date of the meeting in advance.

5. 他们什么时候答复我们的请求还不清楚。

　 　　　 　　 　　 make a reply to our requirements is not clear yet.

4.　 我们是否成功并不是最重要的，最重要的是我们在经历中提高了解决问题的能力。

　 　 　　 　　 　　 isn’t the most important; 　　 　　 　　 is that we have improved our ability to deal with problems through experiences.

3. 我们如何才能和他们取得联系还是个问题。

　　　　 　　 　　 　　 get in touch with them is still a problem.

2. 最让我们吃惊的是他竟然拒绝了我们的帮助。

　　　　 　　 　　 　　 　　 was that he should have refused our offer.