. The production of television commercials must be professional ________ they aim at promoting good service, or public education.
| A．when | B．no matter | C．if | D．whether |
Shakespeare’s play Hamlet into at least ten different films over the past years.
| A．had been made | B．was made |
| C．has been made | D．would be made |
If nothing ________，the oceans will turn into fish deserts.
| A．does | B．had been done | C．will do | D．is done |
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