As we all know is the key to knowledge.
---What’s the matter? ---Something is wrong with my _______. I can’t see clearly.
--- Tea or coffee? ---_______. Just a piece of bread. I feel a little hungry.
---Is the girl in the red skirt your sister? ---No. It _______ be her. She has flown to Australia.
---_______ do you watch TV? ---Only once on Saturday evening. You know as a student I am too busy.
--- Did your classmates have a good time in the Disneyland last weekend? ---Yes. They enjoyed _________ very much.