【2】
1. It ( is dangerous to swim in this river ) in the rainy season.
2. This ( is still too good to be thrown away ).
3. It ( is no use trying to persuade him ) .
4. There ( can be little expectation of his winning ) .
5. She sent her brother ( a letter saying that her father was) in serious condition.
6. In America, huge farms ( run by large companies are more efficient ) than small ones.
【3】
1. 不安になり取り乱して,親は自分を不快にさせたことで子どもを責めてしまう。
2. スーザンは息子が公平に扱われなかったと不満を漏らした。
【4】
1. I’m sorry to have kept you waiting for a long time.
2. I have to get up at 6 a.m. in order to catch [be in time for] the first train.