单项选择

• 1、

  She has proved that she can be relied on in a cris

• 2、

  I have been trying to quit smoking.

• 3、

  America's emphasis on the importance of education

• 4、

  If we leave now，we should miss the traffic．

• 5、

  In Britain and many other countries appraisal is n

• 6、

  She was close to success.

• 7、

  Not all member states abided by the principle they

• 8、

  Enormous sums of money have been spent on space ex

• 9、

  When does the next train depart

• 10、

  While we don't agree, we continue to be friends.（）

• 11、

  There is always excitement at the Olympic Games wh

• 12、

  We've been doing with that company for many years.

• 13、

  The little girl grasped her mother's arm as she cr

• 14、

  Jack is a diligent student.

• 15、

  The most famous Shoshone Indian was Sacagawea—the