Without the air to hold some of the sun’s heat, the earth at night _____, too cold for us to live.
A. would be freezing cold
B. will be freezing coldly
C. would be frozen cold
D. can freeze coldly
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It is necessary that our drinking water _____ cleaner.
A. should be made
B. is made
C. would be made
D. was made
It is high time that our child _____ to do some housework.
A. learned
B. learn
C. will learn
D. would learn
_____ it _____ for your help, I couldn’t have made any progress.
A. Were; not
B. Had; not been
C. Should; not been
Did; be
为了预防漏接事故,导游应保证按规定提前()分钟到达接站地点。
A. 40
B. 30
C. 20
D. 10