Food aid______ is the key to______ the problem _______ now.
| A．only, solve, discussed | B．alone, solving, being discussed |
| C．merely, solving, being discussed | D．alone, solve, being discussed |
9.―Your job ____ open for your return.
―Thanks.
| A．will be kept | B．will keep |
| C．had kept | D．had been kept |
8.Customers are asked to make sure that they ____ the right change before leaving the shop.
| A．will give | B．have been given |
| C．have given | D．will be given |
7.Although the causes of cancer ____， we do not yet have any practical way to prevent it.
| A．are being uncovered | B．have been uncovering |
| C．are uncovering | D．have uncovered |
6.I have to go to work by taxi because my car ____at the garage.
| A．will be repaired | B．is repaired |
| C．is being repaired | D．has been repaired |
5.―Have you handed in your schoolwork yet?
―Yes，I have. I guess it ____ now.
| A．has graded | B．is graded | C．is being graded | D．is grading |