Mum， I've got a medal in the sports meeting．
________!（ ）
A．CongratulationsB．Good luck
C．No problemD．It depends
This math problem isn't so difficult that I can work it out ________．（ ）
A．easilyB．usefullyC．loudlyD．quietly
Don't ________ the chance when you can catch it，or you will regret．（ ）
A．guessB．missC．rememberD．allow
Are you clear about the job of a policeman，Ben？
Yes，to keep people ________ and the society in good order．（ ）
A．busyB．safeC．luckyD．healthy
The earlier kids learn to be independent，the ________ it is for their future．（ ）
A．goodB．wellC．betterD．best
It's a good habit to wash your hands ________ you have meals．（ ）
A．unlessB．whileC．whenD．before