Successful people have some good qualities and above all, they are never ________ a simple life so they keep fighting until they become top ones.

－How can we get to the airport? It’s too far and too expensive to take a taxi.－Don’t worry. There is a ________bus service to the airport.

You’d be exposed to a lot ______ pollution if you moved to a town with pure water and air.

—I can't help but feel very ________ about the matter. Linda, my dear, tell me the truth.—Oh, Mum, there is nothing between Tom and me.

 There were two boys in the lab,_____did the experiment successfully.