26. — Must I clean the room now?

—No, you ______.

A. can’t           B. needn’t              C. wouldn’t             D. shouldn’

27. —What were you doing at 9 o’clocklast night?

—I _______ TV.

A. watch¡¡¡¡B. watched¡¡¡¡C.was watching¡¡¡¡D. is watching