Are you familiar _____________ the rules of baseball?
-Do you know the boy________ is sitting next to Peter? -Yes. He is Peter's friend. They are celebrating his ________ birthday.
--- What do you think about _______dress in the shop window? --- Oh, it's beautiful. Amy will be pleased if she can have it as _______birthday present.
--- Could you be so kind as to close the window? ---______________.
---Excuse me. You shouldn’t smoke here. Look at the sign “NO SMOKING HERE”. --Sorry, I ________ it just now.
---It rains more often in Wuhu than ________Beijing. --- I agree.