on

We cannot judge a person simply on the ______ of this education.

I do not intend to follow that, because we shall have an opportunity to do so on another ______.

A bus ____ when I was sitting on the bench.

I hadn’t seen him for years, but I ____ his voice on the telephone.

They began to draft ______on labour protection.

Last year ______ of new books were published on environmental protection.

He never ________ being looked on as a stupid student.

We can depend on Bob to make a _____ choice

Let’s hang up some paintings on these ____ walls.

You can,　　　　the sky is clear, see as far as the old temple on top of the mountain, but not today.