Humans are destroying nature day by day, ________, of course, will cause punishment sooner or later.

The school _______ I visited the other day was not the one _______ I once studied.

Is this the reason____ at the meeting for his carelessness in his work?

________ you are busy, let us help you finish the project.

Jack wasn’t saying anything, but the teacher smiled at him _______he had done something very clever.

One more month, _______ the grapes in the yard will be ripe.

_______these coins are of different shapes, sizes and colors, they all date back to a long, long time ago.

_____ you make a promise, you should keep it.

The old man was telling a funny story, surrounded by many kids, _________ with fascination.

He was educated at the local high school, ______ he went on to Beijing University.