Take care! Accidents _________ happen along this partof the road

Please _________ the notebook to me.

______ interesting the storybook is!—Yes, I have read it twice.

hat do you think of genetically modified food (转基因食品) —We all think ______ is careless ______ somescientists to say it is safe before doing any experiment.

I think English is __________ unimportant subject.— I don’t think so. It is __________ useful tool when we talk with foreigners.