I study math by ____ lots of exercises.
#49928
A
did
B
doing
C
do
D
does
推荐题目
It takes me a lot of time _________ there by bike.
#49116
A
get
B
to get
C
gets
D
getting
Camels can walk a long way without __________ . 
#50538
A
to drink
B
drinks
C
drinking
D
drank
Although he was a child, he tired to find ways ________ people ________ life more.
#50307
A
to help ; enjoy
B
help ; enjoy
C
to help ; enjoying
D
help ; enjoying