An actor can not well play the role without life experience ____ more than a dancer can make a difference without much practice.

I called Mary many times yesterday evening. But I couldn’t get through. Her brother _____ on the phone all the time.

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

Look, here’s an English book on the desk, Is it yours?— No, it isn’t _______. It must belong to _______.

A human brain can do many things, such as creating new ideas, ________ than a computer.