---What's your favourite season? ---____________ A. I like fall best. B. February is my favourite. C. I swim in summer.
--Can you help me with my English ?
--What are the students doing?--Some______ books and others ______ at the blackboard.
What’s the date today?
The students ______ their homework every day.Now they _______ their homework.
The sun is ______ than the earth (地球).