__________theconvenienceofdigitalpayment,manyseniorcitizensstartedtousesmartphones.
A、ToenjoyInthatschool,Englishiscompulsoryforallstudents,butFrenchandRussianare_________.
Acityistheproductofthehumanhandandmind,__________man'sintelligenceandcreativity.
Teachershavetoconstantlyupdatetheirknowledgeinordertomaintaintheirprofessional___.
—Let'stakeacoffeebreak.
—__________We'vebeenworkingforhours.
Recentlyasurvey_______pricesofthesamegoodsintwodifferentsupermarketshascausedheateddebateamongcitizens.
