I never doubt _____ this exhibition is worth ________.
.—Can you guess ______ .—Derrick Rose , I think.
—Do you mind if I put my baggage here for a while?
—What do you mean?—I'm saying that we need to be careful about ______
Jack is someone ______ you will miss a lot after you leave school.
—Do you remember ______ he came?—Yes, I do. He came by car.