I have a friend. My friend is ________ China.
---Must I return the dictionary today? ---No, you _________. You _________ keep it until next week.
I’m not good at Maths, so I don’t know _________ out this difficult Maths problem.
---Your sister _________ a lot during these years. ---Yes. She _________ three years ago.
I _________ great progress in English since I _________ reading novels in English.
To the students, it’s _________ to enjoy a video during the class.