Here are the best choices for the blanks:

4. Those clouds promise rain; **B. but** we might be wet on the way.

5. Jim likes fishing, **C. and** John likes swimming.

6. Tuan kept talking in class; **C. otherwise** he got in trouble.

7. He said he couldn’t tell us about what happened; **A. instead** he lied.

8. **C. Although** I have searched carefully, I couldn’t find the motorcycle keys.

9. I wanted to spend the Sunday evening at home. **B. However**, I went to a party.

10. She is going to the movies **C. but** she is going to the mall.

Let me know if you need any further help!