-----Tom. You look very bored and tired.
-----Yes, I ______ my father on the farm until seven o’clock this morning.
| A．have been helping | B．had helped | C．was helping | D．am helping |
The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
| A．which | B．where | C．when | D．then |
______ giving up, he went on with his research,got his PhD and married the girl.
| A．Without | B．Except | C．Instead of | D．But for |
Think twice before you make a decision on this matter. It will make ______ to your life.
| A．no difference | B．a difference | C．little difference | D．difference |
Don’t go very far. Stay ______ shouting distance.
| A．over | B．off | C．within | D．at |
The suggestion _______ Tom gave me about how to study English at the meeting was that we ______ as much as possible.
| A．which; would read | B．that; would read | C．what; should read | D．不填; read |