1 . We can save money ________ snacks.

A．by buying

B．by eating

C．by not buying

D．not by eating

2 . You should stop ________ water.

A．waste

B．be wasted

C．wasted

D．wasting

3 . Please stop _________ the earth.

A．pollute

B．to pollute

C．polluting

D．to polluting

4 . Julia didn’t go to school yesterday. She stayed at home.(合并为一句）
Julia stayed at home ________ ________ ________ to school yesterday.

5 . We must stop ________ the oceans. (pollute)

6 . The Earth is in danger. We must stop ________ it.

A．polluting

B．to pollute

C．pollute

D．polluted

7 . We can save water by ________ under a dripping tap.

A．brushing our teeth	B．brush our teeth
C．not brushing our teeth	D．not brush our teeth

8 . I love ________ (eat) dumplings. They’re very delicious.

9 . I enjoy _______ photographs. (take)

10 . Jane takes every opportunity to pratcice ________ English in and out of class.

A．speak

B．speaking

C．to speak

D．to speaking