20、---The accident might not have happened had we been more careful.

      --- But we ________ at that time.

A．don’t         B．didn’t        C．hadn’t          D．weren’t

19、Yao Ming has ________ it takes to be a professional basketball player.

A．who       B．what          C．which        D．that

18、Make ________ a habit to take exercise for at least half an hour every day.

A．what         B．that          C．this           D．it

17、___________ Uncle Tom came, he would bring us some gifts.

A．For the first time       B．Every time that     C．Every time        D．The first time that

16、We’re sick of storm and the bad weather! Hopefully, when we ________ up tomorrow morning, the sun ________.

A．wake; will be shining                     B．will wake; is shining

C．will wake; shines                       D．wake; shines

15、Snow white, though written more than a century ago, still ________ children all around the world.

A．adapts to        B．attends to          C．adjusts to        D．appeals to

14、--- Don’t you want to go to a karaoke bar with us?

      --- I wish I ________, but I have an appointment.

A．may       B．can        C．could         D．should

13、The growing speed of a plant is influenced by a number of factors, ________ are beyond our control.

A．most of them       B．most of which       C．most of what       D．most of that

12、Americans eat ________ vegetables per person today as they did 50 years ago.

A．more than twice                                  B．more than twice as many                     

C．as twice as many                        D．twice as many as

11、People built a monument ________ those who died for the country.

A．in praise of           B．in need of        C．in hope of          D．in honor of