—Why are you so depressed? —I _____ my MP4 player on the bus.
I have no idea ___ David is in trouble, he will turn to you for help.
Who do you think Mr. Brown had ___ within three months?
The most useful learning in the world is that ___ teaches us how to die well.
We should realize that we can only achieve our goal if we are prepared to __ and learn from failure.
Listen! His family must be quarrelling, ____?