帮他们学数学是我的责任。

8. day and night 日日夜夜

all day and all night 整日整夜

day after day 日复一日地

day in, day out日复一日，每天不间断

第二部分：练习

I. 对话填空

Steve: Hello. Can I (1) s to Pippa, please?

Voice: There's no Pippa here. (2) T is 8826049.

Steve: I'm sorry. I think I (3) d the wrong number.

Bob: Hello.

Steve: Hello. Is that Bob?

Bob: Yes, it is.

Steve: Hi, this is Steve. Is Pippa there?

Bob: Yes, she is. (4) W you like a word with her?

Steve: Yes, please.

Bob: Hold on. I'll (5) g and get her.

Steve: Pippa. I called to ask you if you'd like to come to a (6) l on Thursday evening

at the college. It's about the universe. The speaker is (7) s to be excellent.

Pippa: Just a minute. I'll see if I'm free. No, I'm not. I have to see my sister (8) o

that evening at the train station.

Steve: What a pity! Never mind. We must get together some (9) o time for a chat.

Pippa: Yes, good idea.

Steve: I'll have to go now. (10) S _ wants to use the phone. All the best.

Pippa: Bye.

II. 阅读理解

Are you happy? Do you remember a time when you were happy? Are you