It was announced that only when the examination papers were handed in ________to go out of the classroom.
Don’t quarrel with your friend, ________will damage your friendship.
The White Horse Temple in Luoyang is one of the first historic buildings________ to receive special state protection.
—Some English idioms are difficult to understand.—Exactly, ________ you know the meaning of each word.
. Whether ways will be found to stop pollution or not is just ______ worries the public.
What a pity! I _____ in London for three more days, but something urgent needed to be dealt with back in Beijing.