—Why can your neighbor know so much about London?—He ____ have been there before.

— Can I go to the movie, Mum?— Certainly. But you _______ be back by ten o’clock.

Every time they met, they ____ talk about former classmates they remembered.

He bought some books in the bookstore and his father________ him a lot of money.

No student______ go out of school for snacks during the break without the teacher’s permission.