1. (改写句子,句意不变,每空只填一个词) Droughts and floods often happen there because the farmers have cut down all thetrees on the mountains. The trees on the mountains () and as a result,droughts and floods () often ()there.
2. 单句改错。I suggest A(that) the girl B(loses) some C(weight). It's good D(for) her health.