What can we students do _____ the environment?
#50177
A
to protect
B
protected
C
protecting
D
protects
推荐题目
 Mario used to _____________ in the morning.      
#48943
A
practiceswimming
B
practicingswimming
C
practiceswim
D
practicesswimming
Millie, do you enjoy            in the sea?
#50218
A
to swim   
B
swims   
C
swimming
D
to swimming
You needn’t worry about __________ food to eat now.
#49031
A
not have
B
not to have
C
have no
D
not having
My best friend always tells jokes to make me_____.
#49107
A
laugh
B
to laugh
C
laughed
D
laughing