This kind of gel pen which ______ smoothly is quite popular with students.

The number of foreign students _________Chinese Universities_________ rising steadily since 1990.

The performance of the host ,______to please the audience and draw their attention ,was greeted with a cold silence ,however.

— Is there any possible way to help the children get rid of such a bad habit?— To be honest, it’s very hard, but we ______on this problem.

--Excuse me, I don't think you can smoke here. ---Really sorry. I ______ this is a non-smoking room.