根据所给单词的适当形式填空。

1. ________ (luck), she has an opportunity to make an advanced study in Beijing.

2. Edison is a famous _________ (design) in the world.

3. Because of the right _________ (decide), the doctors saved his father successfully.

4. Please __________ (pronunciation) correctly, or I can't understand you.

5. Students are often __________ (sleep) while having classes in the hot afternoon.

6. He's unhappy because of his little dog's__________ (die).

7. All students got ________ (boring) after the long lecture (演讲).

8. You're only twelve years old. Don't get your ears __________ (pierce).

9. I think __________ (memorize) the words of pop songs also helps a little.

10. Keep speaking English every day, your_________ (speak) English will be better.

对（）岁以前的个体来说，心理发展的最大威胁是安全感得不到满足。

A.1

B.3

C.5

D.6