Mr Chen __________ his mobile phone to the shop because it can’t work at all.
---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.