_______ we admit that there are still some problems about the system of modern education, we don’t mean that it is of no use.
| A．Until | B．While | C．As | D．Unless |
What the boy enjoys _____ to have a room of his own.
| A．being | B．to be |
| C．is | D．are |
The president _____ a cool reception when he visited London.
| A．gave | B．was given |
| C．had given | D．had been given |
The theory he sticks to ______ to be of no use in our studies.
| A．proves | B．prove |
| C．proving | D．be proved |
I think this is the very work that we must finish ____ her.
| A．to help | B．help |
| C．helping | D．helped |
. ______ smoking, he would not have got cancer in the lung.
| A．Was he given up | B．Had he given up |
| C．Did he give | D．If he gave up |