the air is badly polluted because some factories don't_______ the rules to protect the environment.
a.appreciate b.regard c.honour d.respect
much notice has been___ the problems with the home-staying children in china.
a.pay to b.kept on c.taken of d.made up
tom put his heart into the wildlife research,and finally,his efforts____ him a great success and fame.
a.saved b.earned c.made d.offered