Opportunities are always as long as we use our minds.
How long do you think it will be ______ the Chinese people land on the moon?
---Will you be _________ this evening, Mary? ---That depends. I am afraid I will be with my manager together discussing a plan.
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.