．You should take __________ measures to avoid danger when doing exercise.

I am _____ to hear the _____ news that my brother has passed the driving test.

. Unluckily I don’t have a lot of ______ memories of my childhood. There were no good friends, no amazing adventures, and no wonderful holidays.

The tiger, once a     animal to humans, is now        of disappearing on the earth.

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