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C. helped D. to help 4. — Mom, can I leave my homework for tomorrow? — I’ m afraid not. Don’ t ___ what you can do today till tomorrow. A. put away B. put out C. put off D. put up 5. — Betty failed in the exam. She must be very sad. — Let’ s go and ___. A. wake her up B. give her up C. cheer up her D. cheer her up 6. Let39。s go to see the sick kids and ___. A. cheer them up B. cheer up them C. clean up them D. fix them up 7. If you do your best, I39。m sure you39。ll ___ do it well. A. can B. could C. are able to D. be able to 8. He didn39。t use to ___ soccer, but now he likes ___ it. A. playing。 playing B. play。 playing C. playin