You must ______ your cigarette when you are at the gas station.
#61283
A
put down
B
put on
C
put off
D
put out
推荐题目
The little girl devoted all her time               the piano.
#59088
A
to practice playing
B
to practicing playing
C
for practice playing
D
for practicing playing
In the fields everything _____ to grow. 
#57110
A
begin
B
begins
C
are beginning
D
is beginning
My sister is only two years old, and I have to _____ her on Sunday.
#59132
A
look for
B
look after
C
look like
D
look at