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1) Because he was busy, he couldn't meet you

2) Because she was sick, she went to bed early.

3) Because the weather was lovely, we spent the whole day in the garden.

5) because the water is highly polluted, we can't swim in this part of the river.

1) because of her age, she can't work hard.

2) because of her beauty, he loves her.

3) because of his carelessness, he broke the vase.

4) because of his hard life, he left school.

5) because of my tiredness, I went to bed early.

1) polluted 2) carefully 3 ) carelessly 4)disappointed 5) pollution 6) polluted 7) conservationists 8)unpolluted 9) disappointed 10) carefully