Complete the sentences using for or since.

1. I have been to a museum__________________________

2. I haven't written a letter__________________________

3. I haven't ridden a bike____________________________

4. I haven't seen a movie____________________________

5. I haven't played computer games___________________

（use for and since correctly.）

(2)Complete the conversation.

A: Hey Eric,______ you enjoyed your time in Beijing so far?

B: Yes, it _______ been great! Everyone is friendly.

A: How long _________ you been in China now?

B: Oh, I __________ here _____ about two years now.

A: Wow, that means you haven't _____ back to the US for two years?

B: No, I ______ been back twice ________ moving to China. ______ you been to the US before, Li Juan?

A: Yes, I went there once when I ____ 10 years old, but I _______ not been back ________ then.

二. 情景导入

T: Answer the questions before you read.

1. Why do millions of Chinese leave the countryside every year?

2. How often do you think these people visit their hometowns?

3. What new buildings does the government usually build in towns and villages?

三．合作探究

1.Work on 2a

理解文章的大意。并对个别难懂有障碍的地方进行注解。

2. Work on 2b

注意理解细节，同时联系上下文，在语境中理解单词短语的意义。

3. Work on 2c