1) We ....... cut down trees. a) must b) mustn't 2) We ....... pollute the seas, rivers and lakes. a) must b) mustn't 3) We ....... recycle paper, plastic, glass and material. a) must b) mustn't 4) We ....... drop litter on the street. a) must b) mustn't 5) We ....... stop illegal hunting. a) must b) mustn't 6) We ....... protect endangered animals. a) must b) mustn't 7) We ....... cycle or walk for short distances. a) must b) mustn't 8) We ....... disturb the balance of nature. a) must b) mustn't 9) We ....... reduce air pollution. a) must b) mustn't 10) We ....... do harm to nature. a) must b) mustn't

7th Grade Must/Mustn't

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