问题

Scientists are working hard to make _______ possible for people to live on Mars in the future.
A:it
B:that
C:this
D:one;
B:that
C:this
D:one;
正确答案是:
同类题型
Do you know ______ this i-pad belongs to —Let me see. Oh, it’s ______.
What a bad day!—Everyone has one of those days when goes right.
If we want to study English well, we should do more exercises.– . Practice makes perfect.
I tried every means to reach my goal but failed. So desperate ______ that I almost lost heart.