_____is known to us all is that we should do as much as we can ______ stop the pollution of the environment.
| A．It; help | B．What; to help | C．As ; to help | D．That ; help |
It is generally considered unwise to give a child ________ he or she wants.
| A．however | B．whatever | C．whichever | D．whenever |
— How did you catch the thief?
— Well, he ________ some goods into his bag when I came around a corner in the shop. So I caught him.
| A．was putting | B．was put | C．have put | D．had put |
It was after what seemed like a century ________ we were allowed to go home.
| A．when | B．which | C．as | D．that |
It was a fine day yesterday. I ________ have taken my raincoat with me.
| A．couldn’t | B．needn’t | C．shouldn’t | D．mustn’t |
They have been working on the bridge for a week. It seems they need ________ two weeks to finish it.
| A．more | B．other | C．another | D．the other |