With sufficient scientific information a manned trip to Mars should be _____.
| A．obtainable | B．potential | C．considerable | D．feasible |
My little sister had an apple in __ his hands.
| A．every of | B．all of | C．all | D．each of |
Reagan was elected ___ of the United States in 1981.
| A．a president | B．president | C．the president | D．as president |
This is the best film __ we have seen this year.
| A．which | B．that | C．in which | D．for that |
He has a poor memory.He has forgotten ___ his dictionary while reading.
| A．carrying | B．taking | C．bringing | D．to bring |
They devote themselves to __ a new way to make populated water clean.
| A．finding | B．look for | C．find | D．having found |