--Where is Xiao Wang?--I don't know. He__________ be in the library.
He arrived here at noon, in the day, and he went out and came back in the day.
The time he has devoted in the past years _______ the disable is now considered ________ of great value.
With the development of science and technology, people’s life _______ in the past few years.
We have moved into a four-room flat so far. Our room is between _____.
---I wonder why Mr Green hasn’t showed up at the meeting yet.---I’m not sure, but he _______ in a traffic jam driving here.