---Peter, where did you guys go for the summer vacation?---We _______ busy with our work for months, so we went to the beach.
8. Usually passengers are required to arrive at _____ one hour before ______ takes off.
9. Which of the following is not a flying machine?
10. As middle school students, raising pet ______ all day long is a sheer waste of time.
11. Don't judge a person only by his _____.
12. --- What's on tonight? --- I hear there is going to be a pop song contest. A group of famous singers from Hong Kong and Macao are ____ in our village theatre.