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

Lucy felt on top of the world when she received the birthday present.

Listen! Kate is playing the piano in the next room. –It _______________be Kate. She has gone to Hangzhou to visit the Cross-sea Bridge.

Jack, is there ______ in today’s newspaper?——No, nothing.

Mom, I have great trouble with my math. —Never __________ and you will learn it well.