go on doing ,at the sane time,be neck and neck,catchup with,comeon
问题描述：
go on doing ,at the sane time,be neck and neck,catchup with,comeon
1.( "the atudents in class3 shouted
2.They both finished their homework ( )
3Malili was in front ,but soon LimLim( )her
4Itwas difficult to say who won the girls'400meters ,because LiLing and Li Ping ( )
5.It was late night ,but he( )his homework
答
1. come on
2.at the same time
3. catch up with
4. be neck and neck
5. go on doing