No one can be right all the time. When people make mistakes, we shouldn’t ________ them.
A. wait for B. send for C. knock at D. laugh at
(2017· 重庆A卷·32)There are so many fish swimming in the pool. They ________ very happy.
A. taste B. smell C. sound D. look
（2017· 重庆A卷·31）Today is Jack's birthday. He is ________ years old now.
A. fourteenth B. fourteen
C. the fourteenth D. the fourteen
The physics problem is too hard, so _______ students can work it out.
A. little B. few C. a little D. a few
________ May 5th, 2017, the C919 took off successfully for the first time at Shanghai Pudong International Airport.
A. On B. In C. At D. Of
We'll have to say goodbye, my dear friends! But I will forget the days we spent together.
A. always B. often C. never D. usually
