China's success in manned－spacecraft travel shows ________ our country has become one of the greatest powers in space research.
| A．what | B．which | C．/ | D．it that |
If something such as a product, an activity, or someone’s career______, it suddenly becomes very successful.
| A．takes up | B．takes in |
| C．takes off | D．takes away |
—Your suitcase seems very heavy. Need any help?
—__________.
| A．That all depends! |
| B．No, thanks. I can manage it myself. |
| C．It’s a pleasure. |
| D．It couldn’t be better. Thank you all the same. |
A common memory they all have ______ their school days is the school uniform.
| A．on | B．of | C．to | D．with |
Every 40 minutes we will take a 20-minute break, ______ your guide will give a short talk on different aspect of the Great Wall.
| A．during that | B．and when |
| C．which | D．during which time |
Languages across the world are becoming extinct ______ endangered mammals and four times endangered birds.
| A．at twice the rate of | B．as twice fast as |
| C．twice faster as | D．twice at rate of |