No one in the department but Tom and I_________ that the director is going to resign.

–Where _______ the socks?   --_______ on the bed.

The number of students in our school        4000 and a number of them     good at playing ping pong.

Nowadays signs prohibiting smoking       a common sight in restaurants, tea houses and shopping malls．

-I called you at 2:00pm yesterday, but there was no answer.-Oh, sorry! I __________ in the garden at that time.