a. had wiped out b. have wiped out c. had been wiped out d. have been wiped out
38.over the past decades, sea ice _____ in the arctic as a result of global warming.
a. had decreased b. decreased c. has been decreasing d. is decreasing
39. the boy insisted that he ___ do it himself.
a. should do b. do c. did d. does
40.how i wish i ____ to my parents’ advice.
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