________ seems to be a strong competition in China for senior high students to enter college or university.
(2011天津卷,1﹚We feel our duty to make our country a better place.
We have various summer camps for your holidays. You can choose ____ based on your own interests.
The two girls are so alike that strangers find ________ difficult to tell one from the other.
(2012陕西卷)No matter where he is, he makes _____a rule to go for a walk before breakfast. A. him B this C. that D. it
Sophia waited for a reply, but ____ came.