—Do you believe that paper is made _____ wood?.—Yes, I do. And you can see that books are made____ paper.
What’s that English? A、on B、at C、in
----I like talking on the Internet with my friends. ---- ______.
I have ______ friends here. They help me _______.
Everyone in the two classes ______ TV.
Skating on the ice is ______.