Mr. and Mrs. Green were very worried about their son, Leo. He seemed to be dumb (哑的)     (1)   he was normal in every other way. Mr. and Mrs. Green tried everything to get him to   (2)   , but were not successful. When Leo was six years old, the best doctors in the town    (3)  him carefully, but could find nothing wrong. And he seemed to be smart. It was just that he   (4)  spoke.
"There might be something wrong with his    (5)   , and he doesn't know he's able to speak," one doctor said.
"But he can read and write," said Mr. Green.
"It's certainly very    (6)   ," another doctor said. "Perhaps he'll be able to speak some day."
  (7)   passed. Leo went to university. But he did not speak a single（单一的）word. Then one day, Leo was having a meal with his parents. Without any warning,(警告) he looked up from his    (8)  and said, "Pass me the salt, please."
 Mr. and Mrs. Green were excited. "You spoke! You spoke!" they cried, "Why have you      (9)   so long to speak?"
"I didn't have anything to say," he said. "Until now everything was perfect. But you forgot to put    (10)   in these potatoes."

(1) A.  because	B.  when
C.  though	D.  before

(2) A.  speak	B.  walk
C.  play	D.  laugh

(3) A.  taught	B.  found
C.  examined（检查）	D.  asked

(4) A.  never	B.  often
C.  usually	D.  always

(5) A.  back	B.  hair
C.  face	D.  mind

(6) A.  understanding	B.  strange
C.  traditional	D.  pretty

(7) A.  Hours	B.  Weeks
C.  Months	D.  Years

(8) A.  chair	B.  meal
C.  hands	D.  books

(9) A.  slept	B.  walked
C.  served	D.  waited

(10) A.  medicine	B.  honey
C.  salt	D.  sugar