Isn’t it time you got down to ___ the papers?
| A．mark |
| B．be marked |
| C．being marked |
| D．marking |
I know he hasn’t finished his homework, but ______, he has done his best.
| A．at all | B．in all | C．after all | D．above all |
We always keep ______ spare paper, in case we run out.
| A．too much | B．a number of | C．plenty of | D．a good many |
—I have studied growing plants as one of my interests. Could I make some suggestions?
—______.
| A．You will make it. | B．Go right ahead. |
| C．Don’t mention it. | D．Take it easy. |
________ recent developments we do not think your scheme is practical.
| A．In view of | B．In memory of |
| C．In case of | D．In favor of |
Science and technology have __________ in important ways to the improvement of agricutural production.
| A．attached | B．assisted | C．contributed | D．witnessed |