When Nancy was at college, she ______ three foreign languages. But I am surprised to find that she ______ all except a few words of each.
The reason for the party was _____ it was Sue’s birthday.
No sooner had we reached the top of the hill _____ we all sat down to rest.
I can think of many cases _____ students obviously knew a lot of English words and expressions but couldn’t write a good essay.
It is well understood _____ controls the flow of carbon dioxide in and out the atmosphere today.
–How far apart do they live? –_____ I know, they live in the same neighborhood.