I often saw him ______ English every morning.
— Look! The girl ______ long hair is making a snowman. Is she Sandy?— It _______ be her. I’m not sure.
The Maths problem is so difficult that _______ students can work it out.
It’s quite cold outside, you had better _________the windows.
The number of the giant pandas in China is getting but the red crowned cranes are getting .
Look! There are many in the sky. I think it will be tomorrow.