---- How about going hiking this Sunday?
---- _______.I love sports and getting close to nature.
A. It’s up to you. B. It all depends C. I’m afraid not D. I couldn’t agree more
Not until I came home last night ________ to bed.
A. Mum did go B. did Mum go C. went Mum D. Mum went
Work hard when young, ______ you will regret.
A. and B. so C. but D. or
It’s hot in the shopping mall, because the air-conditioning system ______.
A. broke up B. broke down C. broke in D. broke out
--- 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
Science has given clear evidence ______ smoking can lead to many diseases.
A. what B. which C. that D. where
