He _______ busy yesterday, or he ___ you with your experiment.
A was, had helped B was , would have helped
C. had been, would had helped D had been, would help
We are in great need of a more capable monitor , ______ with straightforward personality as well as good humor .
A. who B the one C. one D. which
Parents and children should communicate more to _____ the gap between them so that they can understand each other better.
| A．open | B．narrow | C．widen | D．leave |
We are now enjoying the cool air in the room . _____ ，the farmers are harvesting crops in the hot sun .
| A．Therefore | B．Besides |
| C．As a result | D．In the meanwhile |
We can see many examples in our life _____ positive thinking changes a person completely.
| A．which | B．that | C．where | D．while |
______Ｉcould express my thanks to the traveler , he had already disappeared in the rain .
| A．Before | B．When | C．Until | D．While |