to master some knowledge of first aid is(of/for/with/to)grea

to master some knowledge of first aid is(of/for/with/to)grea To have some knowledge of a foreign language is a must for p 跪谢!First aid is the kind of help ___1____ (give) to someone come to the aid of 英语翻译First aid is emergency care for a victim of sudden illne I have a knowledge of English,which is enough to deal with t It's the knowledge of first aid make a difference that when Was_______ John’s quick action and knowledge of first aid __ It is necessary for to do first aid when we _____ someone in 英语翻译it is necessary for us to do first aid when we ___1____ for to of with 区别 英语翻译our challenge is to bring our comprehensive knowledge of