As the proverb ____, an enemy in disguise is a wolf in sheep’s ____.
I saw Jack yesterday. He told me that he would stay here _____ the end of this year.
_____ defeated, they didn't lose heart.
---May I attend your lecture, Mr. Green? ---Welcome _____ open arms.
Some people say that we live _____ the age of computers.
Because of her devotion _____ music, she has become friendly with Mr. Zhang.