There_____alotofrubbishonthefloorsoIaskedMarytosweep_____up.
A. were;it
B. are;them
C. was;it
D. is;them
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Threemilliontonsofcoal______everyyearinthecity.
A. isexploited
B. areexploited
C. hadexploited
D. haveexploited
Whatthechildreninthemountainvillageneed________goodbooks.
A. is
B. are
C. have
D. has
YouandI_____twinsisters.
A. were
B. are
C. is
D. am
Seventy-fivepercentoftheearth’ssurface______withwater.
A. iscovered
B. iscovering
C. werecovered
D. arecovered