下面每句中有一处错误，请改正。

1.Students should apply themselves for their study.

20.　　,Mother will wait for him to have dinner together.

A.However late is he　　　　　B.However he is late

C.However is he late　　　　　D.However late he is

19.The sun was shining brightly,　 everything there　　 more beautiful.

A.making;look　　　　　　B.to make;looked

C.and made;looking　　　　D.and making;be looked

18.　　he came to love sports,he became much stronger than before.

A.After shortly　　　　　B.Shortly after

C.Short after　　　　　　D.Before long

17.He will return　 .

A.in an instant　　　　　B.in instant

C.after an instant　　　　　D.after instant

16.The poor man was made 　 a big family.

A.supporting　　　　　　B.to support

C.support　　　　　　　D.to be supported

15.Mr White,along with his assistants,　 on the project day and night to meet the deadline.

A.work　　　　　　　　B.working

C.is working　　　　　　D.are working

14.The headmaster was dismissed three months ago.The post is too important to

leave　　 any longer,especially before the college entrance examination.

A.alone　　　　　　　　B.away

C.vacant　　　　　　　　D.occupied

13.There is a big library in our school,and this is 　 I often go to get the latest information.

A.where　　　　　　B.that

C.which　　　　　　D./

12.There are a lot of computers in the lab,and they need professional 　 to make sure they can be in a good state.

A.operation　　　　　　B.maintenance

C.service　　　　　　D.advice