Mr Wang is ________ Maths teacher. He teaches ________ Maths.

Where did you get The Frog written by Mo Yan?—I picked it up from a bookshop online if you ________ know.

His strong love for his country is _______ in his recently published poems.

You should remember ________ difficulties we may come across, we will overcome them.

Just as one of the parents ____ it, students today are under far greater stress than ever.