__________ the convenience of digital payment, many senior citizens started to use smart phones.
A、ToenjoyA
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---Ileftmyhandbagonthetrain,butluckilysomeonegaveittoarailwayofficial.
---Howunbelievabletogetitback!Imean,someone______it.
Mr.Smithgradually_____aknowledgeofthesubject.
Scientistshaveobtainedmoreevidence___________plasticisfindingitswayintothehumanbody.
China'simageisimprovingsteadily,withmorecountries__________itsroleininternationalaffairs.
AfewmonthsafterhehadarrivedinChina,Mr.Smith___________inlovewiththepeopleandculturethere.
