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
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