3. Why don’t we       (visit) the Summer Palace this summer?

2. Bill worked       (hard) ，but he could       (hard) pass the exam because it was too difficult.

1. Don’t       (across) the street when buses or cars are coming.

5. Come      !I believe you can do it well.

4. It’s wonderful to see the whole city        the top of the building.

3. The lake looks nice and cool. Why don’t we go       a swim?

2. His new house is        the city centre.

用适当的介词填空

1. Look!They are walking        the lake happily.

5. 咱们沿着湖边走走，穿过小桥，爬上小山吧。 

Let’s       along the lake,         bridges and             the hill.

4. 我认为他们不会允许人们在湖中游泳的。 

I             they       people       swim in the lake.