Peter: Do you know whose pen this is?
 Mary: It may be Sam’s. He just asked me 　48　.
Sam: Oh! Peter, it’s mine. It has a picture of my lucky dog on it.Peter: Your lucky dog?
 Sam: Yes, I am a Dog person, just like you.
 Peter: I don’t understand 　49　.Mary: He means you were born in the Year of the Dog, 1994.
 Peter: Oh, I see. Sam and I were born in the same year.
Sam: The newspaper says that we Dog people are going to be very lucky this year.
 Mary: How about me? I was born in the Year of the Rooster.
 Sam: It says you may often have no idea 　50　 for your future.
 Mary: I think I need some good luck. Sam, how do you get good luck?
 Sam: Well.... Look at my pens, pencils, erasers and rulers. They all have lucky dogs on them.
Mary: Can I borrow some 　51　 you?
 Sam: Sorry. I can’t lend you my good luck.
 * rooster（公）雞
【題組】48.
(A) where was his pen
(B) when did I buy it
(C) when I bought it
(D) where his pen was