He was （） a box on his shoulder.A、carryingB、keepingC、bringing
It （） three years since I joined the air force. 【be】 我加入空军已经三年了。
Mary is not here. She （） to Paris.A、wentB、has goneC、has been
Mary （） into the room.A、burstB、crashedC、hit
Two birds escaped （） their cage.A、fromB、withC、out
The question was so difficult that （） people could answer it.A、littleB、afewC、few
We can finish this work （） a few hours.A、inB、forC、after
He worked in this company （） several years.A、inB、sinceC、for
I （） that book. 【read】 我已经读过那本书了。
They decided to （） into the cause of the accident.A、seeB、lookC、watch