完成句子，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。
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。
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。
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。
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?
________ 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。
完成句子，阅读下列各小题，根据汉语句子，用括号内的英语单词完成句子。
He ________ a phone call，for the telephone is broken and needs repairing．(make)
他不可能在打电话，因为电话坏了需要修理。
It is the most instructive lecture ________ since I came to this school．(attend)
这是自从到这个学校以来我听过的最有教育意义的讲座了。
________ most in the Harry Porter series is not only the fantastic plot but also the charming characters in the story．(attract)
《哈里波特》丛书最吸引孩子们的不仅是奇特的故事情节，还有故事里吸引人的各色人物。
You needn't ________ all the calculations! We have a computer to do that sort of things．(do)
你本不必做这些计算。我们可以用电脑来做。
We'd like to know how ________ a businessman like your age has succeeded in remaining energetic．(it)
我想知道一个你这样年龄的商人究竟怎样成功地保持精力充沛。