—Do you like the city life or the country life? —It's hard to say. In the city there is _____interesting, but in the country there is _____ pollution.
-Mom, where’s my backpack? -You shouldn’t put your things casually, you should take good care of _____ own things.
My brother is studying in ______ university in America; he wants to be ______ astronaut in the future.
Now there are already robots _________ in factories.
Everyone except Tom and John ________ there when the class began.
Mr. Chang has ________ money but ________ friends than Mr. Chan.