our earth, or else it will be no longer fit for us to live on.
#65875
A
Protected
B
To protect
C
Protecting
D
Protect
推荐题目
________ the prices and functions of different types of computers before you make up your mind which to buy.
#66005
A
To compare
B
Comparing
C
Compared
D
Compare
Please do me a favor —_____ my friend Mr. Smith to Youth Theater at 7:30 tonight.
#65964
A
to invite
B
inviting
C
invite
D
invited