10.The house we used to live has been rebuilt.
Weon it for several hours but we haven't yet reached any conclusion.
---Will you help me with this mathematical problem?. ---Sure. Let me see.
He put on his tie, took one last look at the room and_____________ walked out of the door.
______, tears came to her eyes.
---Mary, I heard there was an explosion in Luzhou. Could you tell me how it _______? ---Sorry, I don’t know much about it either.