31. To our surprise, they decided to________their differences and try to face the coming global problems together.
| A．give away | B．take up | C．put aside | D．bring down |
—I’m afraid I have to leave for New York tomorrow.—_____
| A．I’m afraid not. | B．Have a good journey. |
C．Please do. | D．Why not go now? |
---Believe it or not, I have met him before.
---No kidding? ______ you’ve never mentioned it?
| A．What if | B．What for |
| C．How come | D．How about |
It is our duty to try to ______ production and reduce the number of things we make and buy.
| A．cut back on | B．put up with |
| C．hold on to | D．run out of |
Our factory has been developing rapidly this year. This year’s production is five times _____ it was ten years ago.
| A．that | B．what | C．which | D．as |
We should produce less things from raw materials, _____ is growing smaller and smaller.
| A．whose supplies | B．the supply of which |
| C．which supply | D．the supply of whom |