1)
Q: Why won’t the elephant use the computer?
A: He’s afraid of the mouse!
鼠标和老鼠的英文皆为mouse：
mouse [maʊs] n. 鼠标;老鼠;胆小羞怯的人
2)
Q: Which are the stronger days of the week?
A: Saturday and Sunday. The rest are weekdays.
week和weak同音：
week [wiːk] n. 周，星期
weak [wiːk] adj. 疲软的;虚弱的;无力的;不牢固的
3)
Q: Which runs faster, hot or cold?
A: Hot. Everyone can catch a cold.
catch有抓住的.意思，catch acold是感冒的意思
4)
Q: How did the soldier fit his tank in his house?
A: It was a fish tank.
tank n. 坦克;水槽;池塘
fish tank 鱼缸，金鱼缸
5)
Q: How can you tell the ocean is friendly?
A: It waves.
wave有波涛翻滚的意思，也有挥手致意的意思
wave [weɪv]
n. 波动;波浪;高潮;挥手示意;卷曲
vt. 卷(烫)发;向…挥手示意;使成波浪形
vi. 波动;起伏;挥手示意;摇动;呈波形