What is the best way you think of ______ the environment?
#51117
A
to protect
B
protecting
C
protect
D
protected
推荐题目
Half-time is a ________ period for the players _________.
#49074
A
10-minute, have a rest
B
10-minute; to have a rest
C
10 minutes; to rest
D
10 minute; for rest
–Do you have some trouble ____ the problem? Do you need some help?--No, thank you. I can make it myself.
#50320
A
solve
B
solving
C
to solve
D
solved
—Mom, must I take out the trash now?—No, you ________. You may take a rest first.
#48405
A
mustn’t
B
can’t
C
shouldn’t
D
don’t have to