单项选择题

One day I was having a hearty lunch at a fast-food restaurant when an old couple entered slowly. They (36) a meal at the counter. And then they took a seat and began to (37) food out of the dish. On the table there was one small hamburger, one pair of chicken wings and one orange juice. The elderly man (38) what they had into two halves and put (39) in front of his wife with great care.
He tasted the juice. His wife tasted one as well and set the paper cup (40) them. "What a(n) (41) couple! What they can (42) is just one meal for both of them," thought I. (43) the man started eating his chicken wings, I (44) to my feet, went towards them and told them that I was (45) to buy another meal for them. To my surprise, he (46) refused me and said that they considered it a good (47) to share everything they had. (48) . the woman stopped eating. Instead she just sat there and (49) him eat, and taking turns to drink the juice. Once again I (50) to buy them something to eat but they said "No". After a moment, when he was (51) his mouth with a napkin, I (52) not bear it any longer. Therefore, I made an offer a third time.
(53) being refused again, I asked the old lady (54) , "Could you tell me why you aren’t eating You said that you both shared everything. (55) are you waiting for on earth" "The teeth," she answered.

50().

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