English_Riddles_for_Cursive_Practice, 2 羅馬字母連筆字描紅：猜謎 #2（1～7提示和註解）

一舉三得：加強英文、動動腦筋（防止老人癡呆症）、練習草寫，何樂不為？（第二批謎語）

第一批謎語: https://steemit.com/cn/@wentong-syhhae/english-riddles-french-cursive-practice-1

謎語 1～7 的提示和註解：
1 A pilot's brother died, but the dead man didn't have any brothers. How come?
提示：Can a schoolboy become a pilot? An adult man? A schoolgirl?
註釋：“How come?” 隨和語氣專用。正式英文可以說成“How can this be?” or “How is this possible?”

2 I occur once in every minute, twice in every moment, but not once in a thousand years. What am I?
提示：I also occur once in every month.

3 I'm not alive, but I grow. I don't have lungs, but I need air. I don't have a mouth, but water kills me. What am I?
提示：Water is cool, isn't it?

4 What can run but never walks, has a mouth but never talks, has a bed but never sleeps, has a head but never weeps?
提示：My parents are clouds and I like the ocean.
註釋：walks:talks, sleeps:weeps 四個字都押韻。Weeps 聽起來文縐縐的，並不常用。

5 What can travel round the world and yet stay in a corner?
提示：I’m very cheap.

6 What can you give somebody and still keep?
提示：Check a dictionary.

7 What did one wall say to the other one?
提示：What do walls do to each other?