有礼貌,有教养 (polite)It is ____to say "Thank you" and to open doors for people.
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实践，实际，练习，实用的，实际的(practice)____makes perfect.
实践，实际，练习，实用的，实际的(practice)Knowledge without ____makes but half an artist.
实践，实际，练习，实用的，实际的(practice)He is ____the piano now.
实践，实际，练习，实用的，实际的(practice)They are ____singing the new song.
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