You’d better look up the new word in a dictionary _____ you don’t know it ?
Don’t ______ him. He is very happy now.
--_______may I keep this book? --For two weeks.
We have no time to play. We have _________ homework to do.
—Whose book is it? —Look! Jane’s name is on the cover(封面). It _________ hers.
His father often ___________to work.