No one knows ____ in fifty years.
In our city, ________ college students want to work as a teacher in holidays.
I don’t like eating chocolate. The taste is too ________.
-- Look at the boy running on the ground. Is it David?-- It _______ be him. I saw him go to the teacher’s office just now.
They’ve got two machines, but ________ works well.
The teacher asked me to ____ the exercise books before we began to do our homework.