Let's not pick these peaches until this weekend ___________they get sweet enough to be eaten.
| A． |
ever since |
B． |
as if |
C． |
even though |
D． |
so that |
It is strange that such a thing ______ in your school．
| A．will happen | B．happens |
| C．should happen | D．happened |
—What a pity! Their experiment is a failure.
—They ________ better under more favorable conditions.
| A．should have done | B．could have done |
| C．must have done | D．may have done |
more energy to my study instead of being crazy about Internet games, I would be sitting in a comfortable office now．
| A．If I devoted | B．Had I devoted |
| C．Would I be devoted | D．Should I be devoted |
Jack is a great talker. It's high time that he ________ something instead of just talking.
| A．will do | B．has done |
| C．do | D．did |
It is necessary that the government solutions for the problems of air pollution to create a clear environment.
| A．should have found | B．could have found |
| C．could find | D．should find |