14.　 He was _________ (采访)on the radio this morning, which made him well known throughout the country.

13.　 Everything is on sale Children’s shoes are now ________ (降价)to 50yuan a pair.

12.　 A happy family provides a loving _________ (环境) for its children.

11.　 The experience was good _________ (准备)for a career in the film industry.

10.　 All the morning he has been practicing _______ (介绍)himself because some VIP will attend the meeting.

9.　　　 The band play many songs, i______ some of my favorities.

8.　　　 You will be c______ with the best athletes in the world in the Olympics.

7.　　　 We all think that it is i________ to interrupt others when they are talking.

6.　　　 You have to o____ the rules if you want to live here.

5.　　　 Can you explain the causes and e_______ of all these?