His funny hat made the students _____ in class.
At first, I found it hard to follow the teacher because she spoke too quickly.
Would you please tell me _______ next, Mr Zhang?
---What a nice MP3! How long ______ you ______ it? ---Only two days.
Chinese _______ by more and more people in the world now.
If he ______ harder, he will catch up with us soon.