81. Male and female students are quite different from each other ______ the age at which they begin to develop an intellectual self-discipline.
| A．with regard to | B．in the light of | C．in honor of | D．on account of |
Never give up your effort, ______ you are sure to get what you’re trying to get．
| A．and | B．before | C．or | D．but |
—Come in and have a look．Where can you find a so high-quality gift for your loved ones?
—______．Thank you．We have no intension to buy．
| A．That just depends | B．Let us be | C．It’s nothing | D．Take it easy |
Have you any idea ______we can do to help those ______are in great need?
| A．how; who | B．what; / | C．whether; that | D．what; who |
_______ Tom, we wouldn’t have been late for the last bus.
| A．If we didn’t wait for | B．If we haven’t waited for |
| C．we hadn’t waited for | D．Had we not waited for |
The twin brothers stand under the tree, ______ and say nothing.
| A．puzzled | B．puzzling | C．being puzzling | D．being puzzled |