When you’ve finished school, don’t forget to come back to visit your school, ______?
They appeared ____ me, so I had to explain to them.
The _____ of freshwater brought about a lot of difficulties for those living on the island.
The Chairman thought ______ necessary _____ Professor Smith to speak at the meeting.
The problem he put forward at the meeting was _____. Which one of the following is “WRONG?”
Don’t all speak at once! _______ please.