Go and get your coat. It’s  ________ you left it.

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

—I drove to Zhuhai for the air show last week.
—Is that ________ you had a few days off ?

What is even more important is______ the earth cooled down, water began to appear on its surface.

What the doctor really doubts is ______ my mother will recover from the serious disease soon.

What has not yet been announced is _____ the English contest will be held. I guess it may be held in the hall.

—I drove to Zhuhai for the air show last week..
—Is that ________ you had a few days off ?

What is even more important is______ the earth cooled down, water began to appear on its surface.

You are saying that everyone should be equal，and this is________I disagree.

Einstein’s most famous theory is ______ we call the Theory of Relativity.