__________theconvenienceofdigitalpayment,manyseniorcitizensstartedtousesmartphones.
A、ToenjoyTeachershavetoconstantlyupdatetheirknowledgeinordertomaintaintheirprofessional___.
Scientistshaveobtainedmoreevidence___________plasticisfindingitswayintothehumanbody.
Auniversityisaneducationalinstitutionwhich_____degreesandcarriesoutresearch.
AfewmonthsafterhehadarrivedinChina,Mr.Smith___________inlovewiththepeopleandculturethere.
Theyaretryingtomakesurethat5Gterminals_________by2022fortheBeijingWinerOlympics.
