It’s really difficult to ______ what he is trying to express.
| A．leave out | B．break out | C．put out | D．make out |
I was watching the news on TV ________ the power went off.
| A．when | B．as | C．while | D．until ． |
—How long will it be ________ the 30th Olympic Games is held in London?
—It won’t be two years, I think.
| A．when | B．that | C．before | D．since |
When first ________ to the market, the computer software ． was not a success due to its complexity in operation.
| A．introducing | B．being introduced | C．introduced | D．to be introduced |
Have you ever wondered why some of the smartest students in your class sometimes ________ failing exams?
| A．take up | B．pick up | C．come up | D．end up |
In 1986, the Chinese government ________ a law stating that by the year 2000 every Chinese child would have nine years of compulsory education.
| A．impressed | B．introduced | C．interrupted | D．instructed |