Nathan , studying abroad, was _____ to see his friend off at the airport.

—— What do you think of the concert?—— Oh, it was______success.

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

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

Tom is a hard-working student．In fact, you cannot find anyone in the class ____．