He was in the mountain for a year. He felt as if he was ________ from the outside world.
| A．cut out | B．cut in |
| C．cut off | D．cut up |
The program was so fascinating that the children kept their eyes _____on the screen．
A．to fix B to be fixed C．fixed D．fixing
We must be sure that children in our country should get well ______．
A．educate B educating C．education D．educated
The professor devoted all his life ____the treatment of AIDS．
A to research B．in researching C．to researching D．at researching
----Where did you put the broom,Tom?
-----I _______it behind the door．But now it is gone．
| A．do put | B．do putting | C．did to put | D．did put |
They experimented _____the new medicine _____anima
ls．
A．on; to B by ; on C．with ; on D with; to