With sufficient scientific information a manned trip to Mars should be _____.
| A．obtainable | B．potential | C．considerable | D．feasible |
The twin brothers stand under the tree, ______ and say nothing.
| A．puzzled | B．puzzling |
| C．being puzzling | D．being puzzled |
________ that I was puzzled.
| A．So difficult a question did he ask me |
| B．Such difficult a question did he ask me |
| C．Such a difficult question he asked me |
| D．He asked me a so difficult question |
The factory, including its machines and buildings, ______ burnt to ashes during the fire.
| A．is | B．are |
| C．was | D．were |
– Are you cleaning my room?
– I can’t help _____. I can’t bear seeing people’s room in a mess!
| A．it | B．this |
| C．anything | D．so |
He thought that painting copied by a modern artist was ______ great value and bought it ____ over a thousand dollars.
| A．at; for | B．of; for |
| C．of; at | D．for; by |