— Bill, is the pink umbrella Anna’s?— No, it _____ be hers. Hers is purple.
---___________ interesting news it is!--- I think so.
_________ the classmates’ help, we won the basketball final at last.
---Did you get there by_______bike?---No, I took _______ taxi.
----Listen! Is Kitty in the next room? ---- No, it ______ be Kitty. She has gone to Beijing.
The old man _______ since ten years ago.