Помогите, пожалуйста, с модальными глаголами 1. High intensity of human activities ______ be the cause of water pollution a) is able b) may c) ought d) should 2. lanfills are needed for waste that ______ be recycled or safely ...

Помогите, пожалуйста, с модальными глаголами 1. High intensity of human activities ______ be the cause of water pollution a) is able b) may c) ought d) should 2. lanfills are needed for waste that ______ be recycled or safely burned a) can't b) needn't c) mustn't d) should not 3. Efforts to decrease air pollution _____ be made at the national as well as at international levels a)are able b) have c) must d) ought 4. Manufacturers _______ make products that have fewer toxic components a) are able b) need c) ought d) should 5. An effective sewage discharge technology ____ be used to control water quality a) should b) need c) is able d) has 6. Any large engineering projects _____ harm the earth or the life on it a) can't b) might not c) mustn't d) needn't