You’ll fail in the English test ________ you work hard at it.
It was her ___________ performance, but the memory was ____________.
–Why did Miss. Wang look so worried when we saw her.--Because she wondered ______________________.
The time he has devoted in the past years _____________ the disabled is now thought to be ________ great value __________ him.
Many boys and girls are forced ____________ what they have ____________.
–– When will you go back to your hometown? ––__________.