1) ...... plastic bags into the sea. a) We have to throw b) Don't throw c) We must keep 2) We ...... rubbish in the park. a) must throw b) must pick up c) must leave 3) We ...... our classroom clean. No rubbish! a) don't have to keep b) can't keep c) must keep 4) We ...... the sea clean. a) can't pollute b) must pollute c) have to keep 5) We ...... the trees if we pollute the forests. a) can't stop b) have to throw c) can't protect 6) ...... bottles and cans into the sea. a) Don't throw b) Don't clean c) We must throw 7) We ....... pollution now. a) have to make b) must have c) have to stop 8) We ....... the Earth if we want to save our resources. a) must pollute b) have to throw c) can't pollute 9) ...... rubbish in the classroom when you go home. a) Don't leave b) You have to throw c) Don't clean 10) We ...... enough clean air for plants, animals and people. a) have to stop b) must keep c) must pollute

WONDERS OF THE SEA 3 OW4

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