-- I called you this morning, but nobody answered it.-- Oh, we ______ some shopping at the supermarket.
#51991
A
are doing
B
were doing
C
have done
D
did
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Mike promised ______ hard from now on. 
#53719
A
study
B
studying
C
to studies
D
to study
— How about going hiking this weekend? — Sorry, I prefer       rather than      .
#63044
A
to stay at home; go out
B
to go out; stay at home
C
staying at home; go out
D
going out; stay at home
—How about climbing the hill? —I would rather       along the river than       the hill. I'm a bit tired.
#53600
A
walk;climb
B
walking; climbing
C
walking; to climb
D
walk; to climb