When I arrived, the train had .......................... left

46. When I arrived, the train had .......................... left.
a. never
b. yet
c. already
d. suddenly
47. - Mr. and Mrs. Foster finally saw a football game. - ..................... they ever ................... a football game before?
a. Didn't / see
b. Wasn't / seen
c. Weren't / seen
d. Hadn't / seen
48. If you don't hurry, we shall .......................... the bus.
a. catch
b. miss
c. run
d. deceive
49. Lan lives on a farm. She ........................ a traffic-jam before she went to the city last month.
a. did not see
b. were not seeing
c. had never seen
d. has never seen
50. I want you to .......................... a double room for me at Bamboo Green hotel tonight.
a. ask
b. keep on
c. phone
d. reserve