1. Sometimes he has to take life risks to work in order to make a living.
2. He thinks on behalf of the school to give the speech in the general assembling is an honour.
3. Make sure to remind him of the time of the exam. He is very forgetable.
3句中译英,1.为了谋生,有时他不得不冒着生命危险工作（risk)2.他觉得代表全校在大会上发言是一种荣幸.(behal