We’ll do what we can _________ our environment.
#49518
A
protect 
B
to protect 
C
be protected 
D
be protecting
推荐题目
My father always has fun __________with the neighbours on weekends.
#50922
A
to play chess
B
playing chess
C
playing the chess
D
to play the chess
Jim, dad asks you _____ down the TV. Mom is sleeping now.
#50386
A
turn
B
turns
C
to turn
D
turning
._______ to the zoo, take the bus No.5.
#51281
A
Get
B
To get
C
Gets
D
Getting