Booklet Page 16 : More Practice 1 . Complete the sentences below with the correct form of the verb . Use the verbs in the box . a . If it doesn ' t rain soon , the water level of the lake dangerously low . b . Unless we do something about pollution from cars and factories , the air quality c . Public areas will have less litter if we laws that require recycling of plastic , d . If endangered animals are not , they will soon become extinct . e . If we more trees , more oxygen into the atmosphere . f . Unless you waste disposal methods , factories underground water supplies . 2 . Complete the "Better Environment Tips" using the correct form of the verb in the First Conditional form . Use the verbs in the box .
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