When I walked past his house, I heard him _______.
#50226
A
to sing
B
sang
C
sings
D
singing
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Huangshan is a good place to _____.
#49361
A
go sightseeing
B
go for a sightseeing
C
go to sightseeing
D
go in sightseeing
— I tried it out in this way, but I failed.— Why not it in some other ways?
#50281
A
to work; try doing
B
to work; try to do
C
working; try to do
D
to work; to try doing
When I got out of the room, I found someone _____________ the tree.
#50126
A
climbing
B
to climb
C
climb
D
climbs