You have to believe in _________. That’s the secret of success.

What ____ your new friend ____— He is very funny. He likes telling funny jokes.

15．A government, which is responsible for society, must_________to its people how important the method is to prevent AIDS.

At present, lots of people would rather_______in the country because there is________ pollution in the city.

___________does it take you to go to the bus station— About half an hour .