go on doing ,at the sane time,be neck and neck,catchup with,eon1.( the atudents in class3 shouted 2.They both finished their homework ( )3Malili was in front ,but soon LimLim( )her4Itwas difficult
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1. e on
2.at the same time
3. catch up with
4. be neck and neck
5. go on doing