The number of teachers in our school _______ greatly increased last term.A number of teachers in this school ______from the countryside.

You _____ to the meeting this afternoon if you have something important to do.

It is hard to say what kind of person he is．Sometimes he is very friendly; at other times he ___ be very cold．

 --- What’s the weather like? --- Pretty hot and wet in the summer, but it _____ be quite cold in the winter. 

---Are you going to see the film with us?--- I’m not sure. I        go to the concert instead.