-I____it as must of a student that he should say hello to his teachers first whenever they meet.-I can’t agree more.
It was in the dining hall _______ was located behind the teaching building _______ I met her for the first time.
_______ to find the book from the library, she decided to turn to her professor for help.
The Voice of China has set up a stage _______ some people can achieve their dreams.
In Disneyland every year, some 800,000 plants are replaced because Disneyland refused to _______ signs asking his “guests” not to step on them.
We don’t think the experiment is _______ failure. At least we have gained _______ experience for future success.