The reason why he didn’t come to school was ________ he was ill.

Please don’t tell anybody．—I. I promise．

“I think the teacher is wrong, _____?” ——“No, I don’t think so.”

The theory wasn’t accepted by many people when it was first ____, but it proved to be true as time went by.

In modern times, people have to learn to ______ all kinds of pressure although they are leading a comfortable life.