as busy as a bee, Very busy, open a can of worms, To start a complicated problem or argument, the world is your oyster, You have many opportunities and choices, a dog-eat-dog world, A very competitive situation where people are unkind to succeed, a bull in a china shop, A clumsy and careless person, butterflies in my stomach, Feeling nervous or excited, all bark and no bite, Someone who seems aggressive but is not really dangerous, teach an old dog new tricks, It is difficult for older people to change their habits.

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