__ carefully if any change occurs when doing experiments in the lab..
【原创】When his friends heard my story, they _____ laughing.
【原创】I owe you a(n) _____ for what I said this morning. Anyway, I meant no offence.
【原创】The villagers usually get _____ by the hour when they work for the boss.
【原创】Generally speaking, women _____ fewer crimes than men.
【原创】They are twins but they have different _____ .