-Little Tom home for three days. His parents are very worried.
These new types of energy from the sun, wind and water cost very little and will never ________.
— May Day is coming up. Have you decided ________? — I’m planning to go on a trip to Hangzhou.
It’s much easier for us to become friends________ we share similar interests.
— What do you think of the TV show “I’m a Singer” last Friday? — Wonderful! I don’t think I can see a ________ one.
— Look at the slim lady in red. Is that your English teacher? — No, it ___________ be her. She has gone to England.