In that school, English is compulsory for all students, but French and Russian are _________.
A、specialC
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__________theconvenienceofdigitalpayment,manyseniorcitizensstartedtousesmartphones.
He has the _____ of an athlete: he really goes all out to win.
An early typewriter produced letters quickly and neatly; the typist, _____couldn't see his work on his machine.
The number of tickets _____ will be determined by the size of the stadium.
Mr. Smith gradually _____ a knowledge of the subject.
