Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.
| A．since | B．after | C．before | D．When |
In my opinion, the man mad, for he wants to live with a flock of Africa lions.
| A．has grown | B．has gone | C．turns | D．became |
This kind of sea fish doesn’t keep easily. You had better put it in the refrigerator so that it will fresh.
| A．stay | B．stand | C．remain | D．persist |
It is reported that the weather will _____ hot for another three or four days.
A.look B. last C stay D. get
Now people can easily an English person from all American in the way he or she talks.
| A．pick | B．tell | C．take | D．judge |
Don’trude marks about their appearances.
| A．take | B．do | C．make | D．get |