Mike likes to watch the birds _________ in the sky.
#52089
A
flys
B
flying
C
flies
D
fly
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Some of my friends are interested in science,but none of them can tell_____.
#53699
A
when UFOs will appear next time.
B
why do horses know the way.
C
where was this kind of plant found.
D
how do elephants communicate.
—His father ______an actor ,didn't he ?  — Yes, he did .
#55580
A
used to being
B
used
C
used to be
D
uses to be