阅读下列各小题，根据括号内的汉语提示，用句末括号内的英语单词完成句子
____________________ is still a puzzle to us.(lay)
它们什么时候产的卵对于我们仍然是一个谜。
Could you tell me ___________________ on marriage when she was young ?(chance)
你能告诉我当她年轻的时候为什么拿她的婚姻冒险吗？
Where is my English dictionary ? It was here a moment ago. Someone ____________________ by mistake.(take)
我的字典在哪？它刚才在这儿的。肯定有人拿错了。
This morning, as I was working, a man ____________________ stepped into my shop and begged me for some money.(dress)
今天早晨，当我正在工作的时候，一个衣衫褴褛的人走进我的商店，向我讨钱。
I can’t imagine _______________ when they received these Christmas presents.(how)
我无法想像当收到这些圣诞礼物时，他们多么激动。
It’s a small informal party among our old classmates—you _____________________ .(need)
这是我们老同学之间的一个小型的非正式的聚会，你不必盛装打扮。
Your words made Tom angry yesterday, so you ________________ to him then.(ought)
昨天你说的话使汤姆生气，那时你应该向他道歉的。
Mr. Smith _____________ by teaching ten years ago and he gained much experience from his work.(earn)
史密斯先生十年前靠教书谋生，并且从这个工作中获得很多经验。
The girl as well as her classmates _________________ the bird outside the window when their teacher came in.(stare)
这个女孩和她的同学正凝视着窗外的那只鸟时，他们的老师走进来了。
The fact _____________ learning languages delighted his parents very much.(gift)
他在语言学习方面有天赋这一事实使他的父母非常高兴。