Don’t blame them any more---this is _____ because they are still young and lack experience.
Everything around us is ____ solid ..liquid ____ gas.
It is late; ____, I'm too tired to go out.
Mr Wang went to Nanjing ____ October,1998 and came back home ____ the morning of Nov.5.
We have produced 15% more cotton this year____ we did last year.
The teacher is busy ____ correcting papers.