My friend and I often play volleyball ______.
| A．after the school | B．after a class |
| C．after the class | D．after school |
_____ of the water _____ polluted. We must try to protect our environment.
| A．Two third; are | B．Two third; is | C．Two thirds; are | D．Two thirds; is |
He is so poor that he has no house _____.
| A．to live | B．living | C．living in | D．to live in |
The stones are so heavy. How _____ they _____ to the top of the building without modern machines?
| A．do; lift | B．did; lift | C．were; lifted | D．were; lift |
No free plastic bag in the supermarket helps to _____ white pollution.
| A．reduce | B．recycle | C．provide | D．produce |
The young man broke his arm in the accident and had to _____ his job.
| A．give up | B．put up | C．cut up | D．pick up |