21．Only then ____________ the importance of hard work.
A.I realized B.do I realize C.did I realize D.I realize
22.---So your cousin accepted ______ job,right?
---Sure.You know, he had been out of _______ job for half a year.
A.the; / B.a; a C.a; / D.the; a
23.The boy devoted lots of time ________his spoken English, hoping to go abroad upon graduation.
A.practice B.to practice C.practicing D.to practicing
