---He made up his mind to devote his life________pollution_______happily.
A．to prevent;to live B．to prevent;from living
C．to preventing; to live D．to preventing;from living
________you can pass the exam or not depends on yourself.
A．What B．That C．How D．Whether
---- It is generally believed that teaching is __________it is a science.
A．an art much as B．much as an art as
C．as an art much as D．as much an art as
----Three students came late to school this morning, Tom and Jack_______.
A．were included B．were including C．included D．including
----Drinking is harmful_______our health.
A．to B．be C．with D．at
----Must I finish the jod at seven o’clock?
----No, you___________
A．mustn’t B．can’t C．needn’t D．don’t have
