Have you noticed a boy a basketball into the building?
—Do you know when World Non-smoking Day is?—_____________.
如果你想知道对方姓什么时,你应该问_____________________________
---Wow! These inventions are amazing.—They were all invented _______years ago.
---Mary is a careful girl.---Yes. She always goes over her exercises to there are no mistakes.
---Would you like to go to a movie with me?----I’d like to__________ you don’t want to go alone.A. until B before C. after D.if