补全对话T：Good morning，class．
S：{#blank#}1{#/blank#}, teacher．
T: How are you?
S：{#blank#}2{#/blank#}, thank you, {#blank#}3{#/blank#}you?
T: I'm fine, {#blank#}4{#/blank#}. What's this?
S：It's “Nn"(嗯)．
T: No, it's “Nn” /en/.
S：“Nn” /en/
T: Yes, sit {#blank#}5{#/blank#}, please.
