---I can’t work it out in this way.---Why not ________ it another way?

The old man sat in front of the television every evening, happy _____ anything that happened to be on.

There are many beautiful mountains ______ in the south of China.

You can hardly imagine the difficulty the woman had _____ her children.

 English teachers are supposed ______their students a test in class, even after class, ______better teaching results.