根据括号内的提示汉译英,要用过去进行时.急-----------------急---------------------------

戴维做晚饭时烧伤了左手.（when）
When David was cooking,he burnt his left hand.
当我正在看小说时,女儿睡着了.（while）
While I was reading a novel,my daughter fell asleep.
在晚会上,当我们正在跳舞时,他们在唱歌.（while）
In the party while we were dancing,they were singing.
昨天开始下雪时,约翰正在超市购物.（when）
When it began to snow,John was doing some shopping in the supermarket.
当你敲门时,我正在洗衣服.（when）
When you knocked at the door,I was doing some washing.
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