The place _____ the bridge is supposed to be built should be _______ the cross-river traffic is the heaviest.

_______ of the students in our class _______ interested in micro blogs (微博) on the Internet.

A new problem has arisen: how should they broaden the bridge to ______ the flow of traffic

Electric trains have now _______steam trains in England.

What color do you want—I want a ____ one.