--Why does the lake smell terrible?
-- Because a large amount of water_______.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
He said he would rather not _____ it right now.
| A．doing | B．to do | C．do | D．to be doing |
“Must we do it now?” “No, you _____.”
| A．won’t | B．needn’t | C．can’t | D．don’t |
The little girl _____ there alone.
| A．not dare go | B．dares not go | C．dare not go | D．dare not to go |
I’m surprised that he _____ in the exam.
| A．should fail | B．would have failed | C．may have failed | D．should have failed |
Most of the students felt rather disappointed at the English party. They say that it ______ better organized.
| A．had been | B．had to be | C．must have been | D．could have been |