1. _____________________ 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.
2. 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?
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.