Most students think they should have ______ time and energy to develop their own interests.

-What do you think of the traffic in our city?-lt's    than it used to be, but there's still a long way to go.

—We're doing a lot to protect our environment, but it is not good enough. —So we should try______ to look after it.

 I have a lovely room. It’s the ______ in the hotel.

— If there are ____ trees, the air will be cleaner.— I agree. Then there will be less pollution.