1 . We want to keep the city clean. What can we do? (合并为一句)
What can we do ______ ______ the city clean?

2 . We can do many things ______ (keep) our city clean.

3 . 规范书写。
1. keep
2. clean
3. make
4. dirty
5. air
6. messy

4 . What can we do ______ (keep) our street clean?

5 . 连线题。
1. put away                         a. （使）保持
2. keep                                b. 遵守
3. keep to                            c. 把（某物）收起来
4. stay                                   d. 停留
5. cut                                     e. 懂；理解
6. understand                         f. 当心，小心
7. take care                            g. 划伤

6 . Xiaoling ______ herself. Let’s take her to the hospital. (     )

A．keep

B．stay

C．cut

D．enjoy

7 . We promise ______ the environment clean. (       )

A．keep

B．keeping

C．not to keep

D．to keep

8 . The most important thing for a h______ life is to k______ fit.

9 . —How long may I _______ your bike? (     )
—For a week. But you can’t _______ it to others.

A．borrow; lend

B．keep; lend

C．lend; borrow

D．keep; borrow

10 . We should ________ quiet at the library. (        )

A．keep

B．keeps

C．keeping