He is ___this afternoon.

______is very important for us to learn English well.

How many students are there in your school?— There are 2,000 students here __________.

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

I am sorry you’ve been waiting so long, but it will still be some time __________ Brain gets back from his holiday.