After studying in an agricultural college for four years, Jack 　　　　his job as an advisor in the countryside.

______ that he managed to get the information?— Oh, a friend of his helped him. [ ]

There are many people _____only on-line activity is sending and receiving e-mail. [ ]

Now more and more people are paying attention to protecting the environment. So we believe______ there will be less pollution in the future.

I want to buy that kind of cloth because I ________ the cloth_______ well.