完成句子（共5小题10空；每空1分，满分10分）
Practice makes perfect.  ______ a _________(因此), she passed the driving test easily.
When they were young,  they often ____________ against each other _________ (竞
争)the honour of winning.
Mr Li really knows how to ________ _________（对付） his badly-behaved students.
Over the past three days, more and more volunteers have joined them in ___________
________（寻找）the missing girl.
He is          the radio          （拆开）to see what’s wrong with it.