— Who is absent from the lecture today? —_____________you ask? Peter, of course.

Li Lei knows two foreign languages. He can speak _______ English______ French.

--Listen! Tom is singing in the next room.--It _______ be Tom. He has gone to Shanghai. 

Many students are          about football． They          play a game whenever possible．  

Overloaded with work, school teachers now get far less sleep than they ______.