The first use of atomic weapons was in 1945, and their power increased enormously ever since.
| A．is |
| B．was |
| C．has been |
| D．had been |
1 could just see a car in the distance, but I couldn't __________ what colour it was.
| A．make out |
| B．look to |
| C．look out |
| D．take in |
After ten years' hard work, she finally __________ all the debts.
| A．paid |
| B．paid for |
| C．paid off |
| D．paid over |
1 don't think that taxes will be reduced this year,__________？
| A．do I |
| B．don't I |
| C．won't they |
| D．will they |
Jim is intelligent and hardworking ；__________, he is always achieving good results at school.
| A．as a result |
| B．by the way |
| C．in a word |
| D．on the contrary |
It hasn't rained since August；__________, we have to water the vegetable garden.
| A．after all |
| B．as a result |
| C．what's more |
| D．above all |