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答案：1. What was; doing
解析：對(duì)“cooking dinner”提問(wèn)，用“what”，過(guò)去進(jìn)行時(shí)的疑問(wèn)句結(jié)構(gòu)是“was/were+主語(yǔ)+doing”，所以是“What was your mother doing...”。
2. When did; cut
解析：對(duì)“while he was shaving”提問(wèn)，用“when”，原句是一般過(guò)去時(shí)，借助助動(dòng)詞did，動(dòng)詞用原形“cut”，所以是“When did he cut...”。
3. How many times has; been
解析：對(duì)“three times”提問(wèn)，用“how many times”，現(xiàn)在完成時(shí)的疑問(wèn)句結(jié)構(gòu)是“has/have+主語(yǔ)+過(guò)去分詞”，所以是“How many times has Tommy been...”。
4. All of them
解析：“They all”的同義短語(yǔ)是“All of them”。
5. I was telephoning my sister when my son broke the cup.
解析：合并成一句用“when”連接，“我正在給妹妹打電話，這時(shí)我兒子打碎了杯子”，主句用過(guò)去進(jìn)行時(shí)，從句用一般過(guò)去時(shí)。

答案：was going; dropped; everywhere; looked; find; all; son; found; while; put; coins; swallowed; phoned; was doing; didn't; where; told; been; times; any; yet
解析：根據(jù)上下文語(yǔ)境及語(yǔ)法知識(shí)填空?！罢M(jìn)入餐廳”用“was going into”；“掉了硬幣”用“dropped”；“到處都是硬幣”用“everywhere”；“尋找硬幣”用“l(fā)ooked for”；“不能全部找到”用“find them all”；“他們的兒子”是“son”；“發(fā)現(xiàn)硬幣”用“found”；“當(dāng)他們吃早飯時(shí)”用“while”；“把硬幣放進(jìn)嘴里”用“put...in”；“硬幣”是“coins”；“吞下去”用“swallowed”；“丈夫打電話時(shí)”用“phoned”；“正在做家務(wù)”用“was doing”；“不知道”用“didn't know”；“在哪里”用“where”；“告訴丈夫”用“told”；“去過(guò)廁所”用“been to”；“三次”用“times”；“沒(méi)有零錢”用“any change”；“還”用“yet”。

答案：1. She slipped and hurt herself when she was getting off the bus.
解析：“下車”是“get off the bus”，“滑倒受傷”是“slip and hurt herself”，“when”引導(dǎo)時(shí)間狀語(yǔ)從句，主句用一般過(guò)去時(shí)，從句用過(guò)去進(jìn)行時(shí)。
2. While I was boiling eggs in the kitchen, my husband was working in the garden.
解析：“while”引導(dǎo)兩個(gè)同時(shí)進(jìn)行的過(guò)去進(jìn)行時(shí)動(dòng)作，“煮雞蛋”是“boil eggs”，“在花園里干活”是“work in the garden”。
3. We looked for the coins, but we couldn't find them all.
解析：“找了”是“l(fā)ooked for”，“沒(méi)能全部找到”是“couldn't find them all”。
4. While we were having breakfast, Tommy swallowed two small coins.
解析：“while”引導(dǎo)過(guò)去進(jìn)行時(shí)的主句，“吃早餐”是“have breakfast”，“吞下硬幣”是“swallow coins”，從句用一般過(guò)去時(shí)。
5. Tommy has been to the toilet three times this morning, but I haven't seen the coins yet!
解析：“去過(guò)三次廁所”用現(xiàn)在完成時(shí)“has been to...three times”，“還沒(méi)看到”用“haven't seen...yet”。