David, _____ I have been sharing a dorm for more than two years, is quite a funny guy.
As autumn announces its coming, the trees _____ turn yellow, which means winter will draw near too.
Jane said, “What did he hear about a week ago?”Jane asked ____ about _____.
It was the fourth time that Tom _____ in the maths exam.
We are flying at _____ altitude of 6,000 meters and perhaps we will get there at _____ midnight.
---Tom, what a pity. I almost succeeded yesterday.---I told you to be careful before. ___________