We the difficulty together, but why didn't you tell me?
B. might face
C. could have faced
D. must have faced
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 |
Their products enjoy 30 percent ________ of the market in this country because both the quality and their service are fine.
| A．features | B．shares | C．interests | D．sales |
With temperature ________ so rapidly, we could not go with the experiment.
| A．fall | B．falling | C．fallen | D．to fall |