从每小题A、B、C三个选项中，选出能填入空白处的最佳答案。

　　The train started moving．It was full of people of all ages．Near the 　　1　　 sat an old man with his 30-year-old son．As the train passed by, the son was very 　　2　　 as he looked out of the window．“Dad, look! The green trees moving away from us are very beautiful．”

　　This behavior from a 30-year-old son made 　　3　　 people feel strange about him．Everyone started murmuring(小声嘀咕)about the son．“This man seems to be stupid．” Ross said to his wife．Suddenly it started 　　4　　．Rain drops fell on the travelers through the window．The 30-year-old son said with joy, “Dad, look! See 　　5　　 beautiful the rain is．”

　　Ross’ wife got angry 　　6　　 the rain drops made her new suit wet．“Can't you see it's raining, old man? If your son is not feeling well, get him to a 　　7　　 , and don't let him annoy(打扰)us．”

　　The old man didn't say anything 　　8　　．Then he answered in a low voice, “We are on the way back from the hospital．He was blind when he was born, and he only 　　9　　 his vision(视力)last week．Everything is new to his 　　10　　 Please excuse us for the trouble…”

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)