根据汉语提示，补全单词。

1. It _____ (花费) him two hours to fly to Japan last time.

2. He has been a _____ _____(导游) for two years.

3. That boy is so crazy about music that he can play several kinds of _____ _____(乐器).

4. Have you ever been to the _____ _____(水上公园)? 

下列哪项属于固定保持器（）

A.粘固式前牙舌侧保持器

B.标准Hawley保持器

C.改良式Hawley保持器

D.负压压模保持器

E.以上都是