Are these sentences correct?

1. Ni3 xi3 huan1 zai4 fei1 ji1 zuo4 shen2 me?
What do you like to do on the airplane?

2. Ni3 xi3 huan1 zai4 qi2 ta1 guo2 jia1 zuo4 shen2 me?
What do you like to do in another country (visiting another country?

3. Ni3 fang3 wen4 zui4 mei3 li4 de guo2 jia1 shi4 na3 ge?
What is the most beautiful country you ever visit?

4. Ni3 chang2 chang hai3 wai4 lv3 you2 ma?
Do you often travel abroad?

5. Ni3 xi3 huan1 lv3 you2 zai4 dong1 tian1 hai2 shi4 xia4 tian1?
Do you like to travel in the winter or in the summer?

6. Ni3 you3 hen3 duo1 de jia4 qi1 ma?
Do you have a lot of vacations?

7. Ni3 zong3 shi4 shi4 zhe chi1 dang1 di4 de shi2 wu4 ma?
Do you always try to eat the local food in the country you are visiting?

8. Ni3 pa4 fei1 xing2 ma?
Are you afraid of flying?

Xiexie! Thank you.