You'd better do it by yourself. _________else can help you.
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.