单项选择题

• 1、

  --Are you sure you're ready for the test? --（）. I

• 2、

  （）prize for the winner of the competition is （）two

• 3、

  In many ways , the education system in the US is n

• 4、

  It is important to pay your electricity bill on ti

• 5、

  （） online shopping has changed our life , not all

• 6、

  The study suggests that the cultures we grow up （）

• 7、

  We can achieve a lot when we learn to let our diff

• 8、

  That young man is honest , cooperative , always th

• 9、

  Silk（）one of the primary goods traded along the Si

• 10、

  To return to the problem of water pollution , I’d

• 11、

  Scientists have advanced many theories about why h

• 12、

  When their children lived far away from them , the

• 13、

  A sudden stop can be a very frightening experienc

• 14、

  When the time came to make the final decision for

• 15、

  Had the governments and scientists not worked toge

• 16、

  In this article , you need to back up general stat

• 17、

  George（）too far . His coffee is still warm.

• 18、

  I have always enjoyed all the events you organized

• 19、

  I had as much fun sailing the seas as I now do（）wi

• 20、

  —The movie starta at 8:30,and wo can have a quick