12. ---Be careful, _____ you will make mistakes in your exams.
---I know that, Mum. One can never be too careful.A. andB. orC. norD. but
13. Ricky caught a bad cold yesterday, ______ he had to stay at home.A. becauseB. butC. orD. so
14. There is a lot of traffic in the city, ______ look both ways before crossing the street.A. soB. andC. butD. for
15. ---Have you found the information about famous people _____ you can use for the report?
---Not yet. I’ll search some on the internet.
A. which B. whoC. what D. whom
