4. Our teacher suggests ________a meeting to discuss about the solution to keep our environment clean. A. to hold B. hold C. holding D. held 5. Her former leader suggests that she should ________ harder to break her past records. A. to train B. train C. training D. trained 6. The children volunteer to clean up the local park ________ there are lot of used cans and trash there. A. but B. because C. and D. so

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