From Twitter:
A castaway* on a deserted island says:
"If I only had a lighter and a flare gun!"**
The suggested idea is (Choose):
a. He had only those things, but lost them.
b. He needs things--most of all those things, so then he could help himself with them.
c. He wishes he had just a lighter and flare gun.
*A castaway
is a person who has been cast (or "thrown", but not by someone else) away, meaning "lost" in a forgotten, hard-to-locate or distant and "uncivilized" place--away from society, such as a island in the Pacific Ocean.
**A flare gun fires a non-destructive glowing projectile (a flare) into the sky; 1. it is used to send an emergency signal in order for the user to show others his location, so that s/he can be found and rescued. 2. In war time it is used to illuminate where the enemy is.
日本語訳
物語と問題の日本語訳
無人島に漂着した人が、「ライターと信号拳銃さえあれば！」と言います。この言葉の意味はどれでしょう。a その二つを持っていたが失った、b いろいろ必要な物があり、特にその二つがあれば自分を助けられる、c 欲しい物はライターと信号拳銃だけだ。
castaway は社会から離れた遠い場所などに取り残された人。flare gun（信号拳銃）は光る信号弾を空へ撃ち、救助を求めて自分の居場所を知らせたり、戦時に場所を照らしたりするために使われると、原文は説明しています。
解答・解説
Answer: The answer is b.: He needs things--most of all those things (the flare gun and lighter), so then he could help himself with them.Explanation: The answer isn't a., because if only I had is a conditional clause expressing a wish for the present, not regret about the past. And the answer isn't c., because who would wish for only some necessary items and not others--and what would be the point of saying this in the narrative (story)?
原文の正解は b。If I only had ...! は今その物を持っていないことを惜しみ、手に入れたいという願いを表します。過去に持っていた物を失ったという後悔ではなく、「その二つ以外は何も要らない」という限定にもなりません。原文の if only と only の意味の違いに注目してください。