没有人吗。。。挽尊挽尊。。。呜呜呜

各位前辈，有个题望求解！！！
A:hello,liming.B:hello,michael.A:look at the picture.are there any people in it,liming?B:yes,there are.there are some men.they both are my teachers.A:where are they?B:they are in their office.and they are working caerfully.A:what's intheir hands?B:pen.they are writing now.A:what are they do?B:sorry,i don't no.but i know they would_____to do a lot for their students,and they love their job very much.A:_______good teachers they are!B:yes!all our teachers are good.
请问空白处填什么。。。。。

各位前辈。。。。难道我要再开个贴问题么。。。。