—Mary broke up with me!—You_ _have forgotten about the Valentine's Day．

–Look! Someone is cutting a tree on the moon.–It _______ be true, Granny. Our teacher says there is no air there.

You _____ read a book in the sun—it'll do harm to your eyes．                      

----Listen! Is Kitty in the next room? ---- No, it ______ be Kitty. She has gone to Beijing.

_Could I go to the movie this Sunday, Dad?Yes, you_____. But you ______ come back before nine.