The manager said that they had an _____ plan if the plan they had submitted was not accepted.

Your ideas are very interesting, but we need ______ suggestions to get us out of the mess.

Many things that were once considered useful and _____, for example, tobacco, is now thought harmful.

How I was _______when I heard the _______ news!

He plays well or badly according to his mood (心情), so he’s a very _________ player.