1. If he ___________ (tudy) harder, he'll pass he exam. 2. If she gose to school by bike, she ___________ (save) some money every week. 3. I think it _____ (be) beter if everyone is responsible for the environment. 4. School should put bins asound the yard to prevent students ___________ throwing garbage. 5. Water pollution do harm ___________ people heath.

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