有礼貌,有教养 (polite)The ____of this machine is simple.
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有礼貌,有教养 (polite)Bob ____stood aside and let the lady go through the doorway first.
有礼貌,有教养 (polite)The children from that school are known for their ____.
有礼貌,有教养 (polite)It is ____to say "Thank you" and to open doors for people.
实践，实际，练习，实用的，实际的(practice)____makes perfect.
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