To understand the complex situation completely requires more thought than ________ so far.
| A．gave | B．has given | C．has been given | D．is being given |
____, he sometimes makes mistakes.
| A．Though he is careful teacher | B．As he is careful |
| C．A careful teacher as he is | D．Being a careful teacher |
—How did you know it?
—Well, the news ____ all over the town.
| A．was spread | B．spread | C．was spreading | D．had been spread |
I lost my way in complete darkness and ,______ matters worse , it began to rain .
| A．made | B．having made | C．making | D．to make |
The direction _______ which the president would go was kept secret ________ safety concern .
| A．for ; over | B．from ; about | C．in ; for | D．at ; as |
You needn’t take your shoes off when you enter someone’s house in Australia , _____ , of course , they’re very dirty .
| A．if | B．except | C．when | D．unless |