—The dictionary is a useful _______ for understanding new words.
—I think so.
A. secret B. tool C. way
My mother asked me _______.
A.what I was doing
B. what are you doing
C.what was I doing
Linda hasn’t finished her homework ______.
A. already B. just C. yet
The population now is much ______ than that 20 years ago.
A. large B. larger C. largest
Everyone ______ to pick up litter on the ground.
A. is supposed
B. supposes
C. are supposed