A. 用所给单词的适当形式填空。
【小题1】Tom didn’t mean to be _________ (polite) when he shouted. He was just too excited.
【小题2】We Chinese often greet each other by _________ (shake) hand.
【小题3】After hours of _________ (discuss), they let through the report in the end.
【小题4】People in our country often queue _________ (patient) while waiting in public places.
【小题5】Mrs. Lin is too busy _________ (explain) any of the long sentences right now.