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It’s not _________(礼貌的)to talk with your mouth full．
______ a polite (有礼貌的) "Good morning," he came in.
[ ]
A. In B. For C. With D. On
It's impolite(没礼貌的)________ a lady about her age in western countries．
A．ask
B．to ask
C．asked
D．asking
“插队”是不礼貌的，你应该等轮到你。
It's ________ ________ to jump the queue. You must wait for ________ ________.