–Look! A man is cutting a tree on the moon.--It ______ be true. The teacher said there is no air on the moon.
---Listen! Kate is singing in the classroom. ----It_____be Kate. She has gone to the Library.
The songs of Coco sound________. Her CDs sell_______.
Bob has made a lot of promises, but______of them have been carried out.
Many did all ______she could to get on well_______her classmates.
She hates people_______don;t help others when they have trouble.