— Some of my classmates don’t like math because they think it’s boring.— I don’t like it, _____. I think it’s too difficult.

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

The children felt _________ because of the _______ result of the football match.

 — It’s so cold today.— Yes, it’s       colder than it was yesterday.

Oxford University is _______with tourists for its beautiful old buildings.