He is very careful when he is-----(on,at)work

He is very careful when he is-----(on,at)work 1、He is very careful when he drives(对very carefu提问) _______ He is a very careful person. 他工作一直很认真he is very careful in his work ___ ___ ___ He is very clever.H_____,he isn't careful () he is very tired he is still going on with his work.hurry 同义句he is very careful. he cando it well he is careful____ __ He does the work is very well He is very careful,so don" worry about his S_______ Mr Brown is always careful when he _____(drive) He is at work now.同义句 He father is( )work at the moment.