This kind of music ____ fifty years ago is still popular today
Anything __________ could be found has been used to repair the damaged bridge.
If the way __________ you think of is not good enough, you can learn the way __________ the top students deal with their study.
The doctor did __________ he can __________ the boy.
I'll never forget the day __________ we worked together.
We have been caught __________ the rain and are really wet __________ the skin.