是谁呀？

　　1.Who's there?

　　谁在那里？

　　2.Who is it?

　　你是谁？

　　1.Unlock the door and let me in.

　　把门打开让我进去。

　　2.May Icome in?

　　我可以进来吗？

　　1.Ring the doorbell.请按门铃。

　　2.Please use the door knocker.请用门环敲门。

　　1.He is a door-to-door salesman.

　　他是上门推销员。

　　1.Look through the peephole to see who it is berore you open thedoor.

　　开门之前，要从门上的透视眼看看来者是谁。

　　2.She uses a chain lock.她用链锁锁门。

　　1.take off the shoes.把鞋子脱下来。

　　2.Wipe your feet on the welcome mat.

　　在门前的垫子上踩一踩，把脚底擦干净。

　　Who is it?

　　It's me, John.

　　Just a moment,please.

　　Come on in, John.

　　Thank you.

　　Hi, Mrs. Lee.

　　Can John come out and play?

　　Yes.

　　Come in and I'll get him.

　　Hello,ma'am.

　　I'm introducing a new vacuum cleaner.

　　Is it expensive?

　　It's a great value.

　　May I take a moment of your time and give you a brief demonstration?

　　我可以占用你一点时间，为你做一个简短的展示吗？

　　I don't really have time.

　　Come back tomorrow.

　　unlock 开锁knocker 门环peephole 门上的透视眼mat 垫子introducing 介绍（introduce 的现在分词）vacuum cleaner 吸尘器brief 简短的demonstration 示范