--- Hi Mike, are you busy now?

   --- Not really. I _____ my work, and I’m going to see a movie online.

A. did         B. have been doing     C. had done       D. have done

No pleasure can equal ______ of having a good sleep after hard work.

A. that         B. one              C. it           D. those 

The weather in Inner Mongolia is always dry, but sometimes it _____ rain heavily.

A. need         B. can           C. must          D. shall

 We admire this family, ______ the parents treat their child like a friend.

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

Science has given clear evidence ______ smoking can lead to many diseases.

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

--- It’s the fourth time that heavy smog(雾霾) has hit the city this month.

   --- It’s high time we _______ measures to fight air pollution.

A. will take       B. took            C. to take        D. taking 

 It’s hot in the shopping mall, because the air-conditioning system ______.

A. broke up      B. broke down       C. broke in       D. broke out

Work hard when young, ______ you will regret.

A. and            B. so              C. but          D. or

Not until I came home last night　________ to bed.

A. Mum did go      B. did Mum go     C. went Mum     D. Mum went

What _______ pity that you must leave now! It is such _______ great fun to have dinner with you

A． a; a         B． a; the         C． /; a                 D． a; /