AIDS control and prevention is a to China as well as the whole world．
| A．surprise | B．challenge | C．reaction | D．threat |
Playing on a frozen sports field sounds like a lot of fun. Isn't it rather risky,？
| A． | though | B． | also | C． | either | D． | too |
-- According to my grandma, it is a good idea to eat chicken soup when you have a cold.
-- __ , scientists agree with her.
| A．Sooner or later | B． Once in a while |
C．To be exact | D．Believe it or not |
"Youhave a wrong number," she said. "There's no one of that name here. "
| A． | need | B． | can | C． | must | D． | would |
For many years, people __ electric ears. However, making them has been more difficult than predicted.
| A．had dreamed of | B．have dreamed of | C．dreamed of | D．dream of |
__ that's important is that you are doing your best and moving in the right direction.
| A．One | B．All | C．Everything | D．Anything |