7.Perhaps it will never be known __________ he did with those materials on the incident.
Parents are advised to take pressure ________ a child and give him some encouragement before an exam.
I’m afraid I haven’t got a very good ________ of direction. I always get lost in the city.
Some people would rather ride bikes as bike riding has ________ of the trouble of taking buses.
In America, if ________ friend has invited you to drop by anytime, it is ________ best to call before visiting to make sure it is convenient for him.
______ I admit that the problems are difficult, I don’t mean that they cannot be solved.