Having received a telegram, he flew home,
後に続く適切な文の4択。

1.instead of find his father dead.
2.in case of find his father dead.
3.because of find his father dead.
4.only to find his father dead.

これどうやって正解を知るのですか？
同じパターンの問題がもうひとつ

He went to the seaside (４択) be drowned.

1. as to
2. in order to
3. not to
4. only to

正解以外のまちがい理由がぜんぜん分かりません。
説明を見ても分かりません。