There's only one day to go. You _____ finish your schoolwork by tomorrow.

 --- You didn’t tell your parents the date of our graduation ceremony, did you? --- No, but I ____. My sister had told them.

–Whose shirt is this?--It _______ be Li Lei’s. It is too big for him.

 Sir, a Mr. Wang is waiting for you at the gate. ________ he come in or stay there?

— Must I return the book tomorrow?— No, you ________. You can keep it for three days.