The two brothers look so much alike that itis difficult to ______

Do you think you will give me a hand in time of trouble? –I’d like to do something for you ______ everything you’ve done for me

Now the air in our city is _______ than it used to be. Something must be done to stop it.

busy preparing a secret present for his Mum,______ is cheap but special

that people who read for pleasure have developed more imagination and good language skills than people who prefer to watch TV