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) cant b) neednt c) mustnt 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) cant b) might not c) mustnt d) neednt

May    cant    must   should   should   mustnt