20. No equipment provided by the company is so advanced as _________ listed in the product introduction.
A. what B. one
C. that D. such
19. It is necessary that every boy and every girl ________ the same education opportunities.
A. has B. have
C. must have D. will have
18. --The air is full of smoke and people are coughing.
--It’ll get worse _______ the government does something about pollution.
A. but B. if
C. unless D. except
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