---Mr. Wu, can I have a look at the scores?---Well, you are a senior, so I_____ hardly remind you that the scores are not open to students.
We must do something to _____ factories _____waste water into the river before it is cleaned.
What way are you thinking of _____ rid of the flies?
Jack is a good friend _____, he often comes to our home for a visit.
You can say "He went there _____, not _____."
I come to tell you Jack _____ for London next month.