Trees used to be______for cooking by the hunters in the 1970s.
| A．cut up | B．cut down | C．cut off | D．cut out |
He learned hard ________ he could go to a good university.
| A．because | B．in order to | C．so | D．so that |
He gave his life to ________ Chinese soldiers.
| A．help | B．helping | C．for helping | D．helps |
Mao Zedong is remembered ________ his greatness.
| A．in | B．as | C．for | D．with |
One of the best teachers in our class________ born in Shanghai.
| A．is | B．are | C．was | D．were |
Yang Liwei is the first man ________ the moon.
| A．to step | B．step | C．stepping | D．steps |