单项选择题
The drunk man was running from side to side in the crowd and he knocked into （）.
A. one person after another B. one by one C. a man and woman D. persons after persons
单项选择题 "What's your opinion of our teacher's new painting" "It would seem to me that it's （） his usual standard."
单项选择题 When you go to a foreign country, you must（）yourself to new manners and customs.
单项选择题 We were heartedly arguing about the financial matter, （）the telephone rang unexpectedly.
