The red bike _______be Hu’s. She has a blue bike.
In the past few years there _________great changes in my hometown.
--- Don’t step on the grass next time, Mike. ---________.
They _______ in Nanjing since they came to China two years ago.
I don’t know when my son ________ back. When he_________ back, I’ll call you.
---Must I finish doing my homework now, Mum? ---No, you ________.