In that school, English is compulsory for all students, but French and Russian are _________.
C
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Thefactthatsomanypeoplestillsmokeinpublicplace_______thatwemayneedantionwidecampaigntoraiseawarenessoftheriksofsmoking.
__________theconvenienceofdigitalpayment,manyseniorcitizensstartedtousesmartphones.
AccordingtothepsychoanalystSigmundFreud,wisdomcomesfromthe_____ofmaturity.