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 |
It is not a problem ______ we can win the battle；it's just a matter of time．（ ）
| A． |
whether |
B． |
why |
C． |
when |
D． |
where |
Building such a bridge over the bay was ______，but the local government made it within two years．（ ）
| A． |
a wet blanket |
B． |
a piece of cake |
| C． |
a dark horse |
D． |
a hard nut to crack |
They decide to have more workers for the project ______ it won't be delayed．（ ）
| A． |
even if |
B． |
as if |
C． |
now that |
D． |
so that |
If you look at all sides of the situation，you'll find probably a solution that _______ everyone．（ ）
| A． |
suit |
B． |
suited |
C． |
suits |
D． |
has suited |
Many lessons are now available online，from ______ students can choose for free．（ ）
| A． |
whose |
B． |
which |
C． |
when |
D． |
whom |