The microphone enabled them to keep in touch, in other words, it made it _____ for them to contact each other.
We on 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.