11.　 My newly-bought camera has many advantages and it can offer you ______ (照片) in a minute.

10.　 On the wall is a c______, which tells the date, the day of the week, the month and the year.

9.　　　 What she described in the letter r________ me of the days of the week, the month and the year.

8.　　　 Nowadays people can hardly do anything without e_______, although it is dangerous .

7.　　　 The v______ of living things can greatly keep the balance of nature.

6.　　　 Boys and girls, attention, please. I have something important ________ to you.

5.　　　 All kinds of music have a common c_______ : to communicate emotion and thought.

4.　　　 Those small coal factories are causing a lot of e_____ pollution with all their dust.

3.　　　 The young man from abroad is in charge of the d_______ of biology of Beijing University.

2.　　　 His manner made it clear that he wasn’t a common gunman, but a p_______.