听录音，写单词，补全对话。
W:
What are you {#blank#}1{#/blank#}, Tom?
M:
I'm {#blank#}2{#/blank#} a letter to my parents in the US.
W:
Do you {#blank#}3{#/blank#} them?
M:
{#blank#}4{#/blank#}.
W:
It's twelve o'clock now. Let's go to a {#blank#}5{#/blank#} for lunch.
M:
OK. Let's go!
