Last summer I took a course on___________poisonous gases.
Either you or one of your students __________ to attend the meeting that is due tomorrow.
What we have to admit is that never in the past thirty years __________ so greatly as today.
There was such a long queue for coffee at the intervals that we __________ have to give up.
It will cost a lot of time. __________I think we shall need it and it will certainly be useful to us more or less.
If I hadn’t wasted so much money last year, I __________ my own apartment now.