Having checked the doors were closed, and _________ all the lights were off, the boy opened the door to his bedroom.

Do not let any failures discourage you, for you can never tell ______close you may be to success.

Unfortunately, women were not admitted to university in the past, ______, nowadays, they have got equal rights.

Cheer up! It won’t be ______ we can meet again.

The president did much for world peace. That was ______ he was awarded the Nobel Peace Prize.

Apple CEO Steve Jobs died of cancer in October, 2011, ______ made most people sad.

Tom is          good a student        he is often praised by the teacher.

How long do you think it will be _______ China sends another manned spaceship to the moon?

It was 1995 __________ we began to develop the new computer system.

---Sunday is a public holiday, _____children should get close to nature.
---But most of them have several lessons to attend.