People have always been curious how living things on the earth exactly began.
| A．in | B．at | C．of | D．about |
The speech was wonderful ______ it lasted too long．
| A．as if | B．for | C．except that | D．except when |
This old professor insisted that he _____energetic enough and that he _____．
| A．be, shouldn’t retire | B．was, not retire |
| C．should be, shouldn’t retire | D．was, should retire |
__________ is always the husband who __________ first when a quarrel comes about between the young couple．
| A．It, gives away | B．This, gives out |
| C．It, gives in | D．That, gives off |
Scientists say it will be five or six years ________ it is possible to test this medicine on humans．
| A．after | B．before | C．since | D．When |
You are students in the No．168 Senior High School now, but you _______ in different junior high schools for three years．
| A．studies | B．have studied |
| C．studied | D．were studying |