10.I didn't join them yesterday evening __________ I had to go to an important meeting.

9. _________ we came to the university, we have learnt quite a lot.

8. They will help you __________ you meet with difficulty.

7. __________we had enough time, we walked to the cinema.

6. He didn't come to the lecture, __________ he was very busy.

5. __________ you go in China, you can see smiling faces.

4. I like the English people, __________ I don't like their food.

3. Let's begin our meeting __________everyone is here.

2. He began to work __________ he got there.

1. Dr. Bethune (白求恩) came to China __________ he was fifty.