通读下面短文,掌握其大意,然后从短文后各小题所给的选项中选择最佳的一项.

通读下面短文,掌握其大意,然后从短文后各小题所给的选项中选择最佳的一项.
It was a Sunday in summer and all the trains were full of people.An old man was looking __31__ a seat.Suddenly he saw _32___.A small bag was lying on the seat and a young man was sitting beside it.
“__33__ sit here?” asked the old man.“No.It’s taken.” The young man answered.“The person has gone to buy a newspaper.He’ll be__34__ soon.”
“Well.” said the old man,“I’ll sit here __35__ he gets back.”
Ten minutes passed.The train __36__.“Too bad!He’s missed __37__,” said the old man,“But he shouldn’t lose __38__ bag.”
With these words he took the bag and started to throw __39__ out of the windows.The young man jumped up.“Don’t!” he cried out.“That’s… that’s my __40__.” His face turned red.
（ ）31.A.in B.for C.after
（ ）32.A.something B.only C.one
（ ）33.A.Do you B.does anybody C.Can“t
（ ）34.A.back B.away C.off
（ ）35.A.if B.when C.until
（ ）36.A.began B.started C.got
（ ）37.A.you B.his bag C.the train
（ ）38.A.his B.my C.your
（ ）39.A.himself B.one C.it
（ ）40.A.seat B.train C.bag
短文的和为啥要选,你不给我说还不是等于抄?分我会给的