_________ no doubt that a green campus plays an important role in the growth of students, both physically and mentally.

I often visit my parents, who live in the countryside  whenever ____.

          any further information, please contact us in our office in London.

 It is the first time that you have come to China, _____?

Students used to_____ information from newspapers or magazines, but now they are used to ______ for it on the Internet directly.