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________ hard is the key to success.
#51086
A
To work
B
Work
C
Worked
D
Works
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I can’t wait ____ the present box.
#48643
A
open
B
to open
C
opening
D
opened
It is a good time _______.
#49260
A
sing.
B
to sing.
C
singing.
D
sang.
Would you mind _________ the piano softly ?
#50945
A
to play
B
playing
C
played
D
play
Could you please ________?
#49476
A
do the dishes
B
doing the dishes
C
to do the dishes
D
did the dishes
So many kinds of sweets! I really can’t decide _______. 
#48578
A
what to buy
B
which to buy
C
to buy which
D
to buy what