Lei Feng is always ready to help others when they are in trouble and he never _______ their request.
| A．turns up | B．turns over | C．turns in | D．turns down |
Between the two periods of classes is a break, we can have a short rest.
| A．then | B．where | C．when | D．which |
— Your room looks a real mess, Tony.
— ____?
| A．What for | B．So what | C．What if | D．So how |
The little boy is lucky enough to have escaped ____ to death in the big fire.
| A．burning | B．to be burned |
| C．being burned | D．to have been burned |
— I am sorry to hear that your mother is ill in hospital.
— ____.
| A．That’s all right |
| B．You don’t have to be so sorry |
| C．It is nothing |
| D．It’s very kind of you |
Generally speaking, in the United States ____ 15-percent tip is normal for ____ most restaurants.
| A．a; / | B．an; the | C．/; a | D．/; the |