He focused his effort ____the house ___sale for fear that the prices of them would go up suddenly.
| A．on; for | B．on; in | C．to; for | D．to; in |
I would love ______ to the party that evening, but I had an unexpected visitor．
| A．to go | B．to have gone | C．going | D．having gone |
Thomas _____ in inventing many electrical machines
| A．was successful | B．succeed | C．was success | D．successes |
The Changjiang River has been polluted badly and is not good _______．
| A．to swim it | B．to be swum in |
| C．to swim in it | D．to swim in |
I think he must have seen me at the meeting last night, ______?
| A．didn’t he | B．don’t I |
| C．do I | D．mustn’t he |
The ______ look on his face suggested that he ______ that he would fail in the Maths test．
| A．surprising; wouldn’t expect | B．surprising; hadn’t expected |
| C．surprised; hadn’t expected | D．surprised; shouldn’t expect |