句子写作：Thepianoplayerbegantosingloudly.
The piano player began to sing loudly ,beating the keys with magic hands ,and nodding his head in rhythm.
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Wepromisethatwe’llmeetagainafterwe_______ourcollegeeducationinthreeyears’time.
Thereistheappreciationofthesalienthistoricaltruth________theagingofadvancedsocietieshasbeenasuddenchange