---Are you two old acquaintances? ---Yes, we _____ in the same neighborhood for quite a long time, though he went abroad with his family at 14.
_______ the days going on, the weather is becoming hotter and hotter.
We tried to ______ his doubts and let him tell the truth.
Advertisements are a good __________ sell products or services.
Violence (暴力) computer games may have a bad ____________ on children.
Mary is often heard ________ playing piano in the next room in the evening.