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20、Hard work and lack of sleep has _______ her beauty and youth in recent years.

A．worn out        B．tried out         C．made out         D．sent out

19、Alice _______ a good salary in a job but she stayed at home for the sake of her family．

A．must take                                                   B．should have made

C．would make                                D．could have made

18、— Has your former classmate come back from America?  

— Yes, he _______ there for eight years.

A．has stayed           B．stays        C．stayed         D．had stayed

17、— David, keep _______  in mind that you have to be home by 10 o'clock.

— OK, Mom, I will．

A．it            B．me          C．this          D．one

16、The managers were discussing the plan which they all wanted to see _______ out that month.

A．carried         B．to carry         C．carrying               D．carry

15、All the neighbors admire this family _______ the parents are treating their child like a friend.

A．why          B．where             C．which          D．that

14、As long as I can remark, _______ I called, my son would answer.

A．before          B．while        C．until          D．a(chǎn)ny time

13、Make sure the gas is turned off after a bath, which would _______ cause danger.

A．somehow          B．meanwhile      C．otherwise             D．furthermore

12、Determination is a kind of basic quality and this is _______ it takes to do jobs well．.

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

11、Many new _______ will be opened up in the future for those with a university degree.

A．realities         B．necessaries          C．opportunities         D．probabilities