1. lag behind 落后

If your payments of rent lag behind, you will be asked to leave.
你要是不能按时付房租，就要请你搬家。

Be modest, otherwise you will lag behind.
要谦虚，否则就要落后。

2. pragmatic 实际的,实用主义的

I would define him as a pragmatic realist,tough,disciplined,dedicated and willing to take responsibility.
我认为他是一个讲求实用的现实主义者，顽强不屈，严守纪律，有献身精神，而且乐于负责。

Took a bookish rather than a pragmatic approach in solving the problem.
以书呆子气的而不是务实的态度解决问题

3. impetus 动力,推动力

The historic strike gave an enormous impetus to the whole American labor movement.
这次历史性的罢工对整个美国的劳工运动起了很大的推动作用。

The present conflict may provide fresh impetus for peace talk.
目前的冲突可能会给和谈提供新的推动力。

4. lament 悲叹,悔恨,恸哭

A poem or song composed especially as a lament for a deceased person.
挽歌，挽诗专门为悼念某一死者所写的诗或歌。

Short pleasure, long lament.
【谚】痛快一时，痛苦一世。

5. spark 闪烁,闪光,使拿出朝气