Question

We can't swim in this river because the weather is very dirty.

-> Because of ....................................................................

Answer 1

1. We can’t swim in this river because the water is polluted.

-->Because of the polluted water, we can't swim in this river

Answer 2

Because of the dirty weather, we can't swim in this river

Answer 3

Because of the dirty river, we can't swim in this river (mk nghĩ đề nên chuyển "weather" => "river" thì nghĩa có vè hợp lí hơn)

Answer 4

Because of the dirty weather, we can't swim in this river.

P/s: Mình nghĩ từ weather nếu thay thành water thì sẽ đúng hơn.