—I’m in Class 4. Are you in Class 4, ____?—Yes, I am.
If you feel tired , you may stop _______.
A table is made _____wood and paper is made ______ wood, too.
_______ the weather , the swimming match has been put off.
I haven’t seen my old friends for years, I ‘m looking forword ______ them.
—Jim, have you done homework_________? ---- Yes, I have _____ done it.