There are millions of websites on the Internet and there _________ a lot of useful ________ on the websites. 

There aren’t any___ between them.

—The dictionary is an important _______ for students .Each of us must have one . —I think so .

— Could you please tell me something about the two_   ?— ____. They arc exchange students of No. 1 Middle School.

—Are these your ____________, Jack? —Yes, they are. I like them very much.