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A. and B. or C. but D. so 12. Little Helen is very young, ______ she knows a lot of things. A. so B. as soon as C. but D. Since 13. Tom, keep away from the fire, _____ you will get burnt. A. and B. so C. but D. or What a nice Tshirt! Can I have it, Mom? Well, it really looks nice, _____ I think it’ s too expensive. A. for B. or C. but D. as 15. Martin and his friends didn’ t eat up all the food they ordered, ____ they took the rest away. A. for B. so C. or D. as 16. Tony is a quiet student, ______ he is active in class. A. and B. or C. so D. but 17. Lily, it’ s time to study! ______ you promised me to play basketball, mom. A. But B. So C. And D. Or 18. Our monitor is always ready to help others, _____ everyone in our class likes him. A. but B. because C. or D. so 19. It was raining heavily, ____ we decided to stay at home and watch TV. A. because B. but C. so D. or 20. The new dress fits me well, ______ I like it very much. A. so B. but C. because D. and 21. ______ he has made great progress in his studies, he’ s still keeping working hard. A. Although B. If