--May I speak to your manager at four o’clock this afternoon?--I’m sorry. He ________ to a conference long before then.
I’ve already told you that I’m going to but it, _____.
You will want two trees about ten feet apart, from ______ to suspend your tent.
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.