阅读下面短文，从短文后所给各题的四个选项中，选出可以填入空白处的最佳选项。
Zhang Jin was so lucky to have a free trip to Thailand. But he didn't ____21___ to have a dangerous experience. The next day, when Zhang Jin arrived in Bangkok (曼谷), he was shocked to find himself in a city ____22___ with street battles (战斗) between two groups. One group was supporting the Thai government while the other was ____23_____ it and had street battles with the ____24____. Two people were killed and hundreds injured. Because of it, 240,000 foreign tourists, including over 3,000 Chinese people like Zhang, failed to leave and had to_____25___ in the country.
"We were ___26___ on the streets. But we felt at home with other Chinese from Hong Kong or Taiwan," said Zhang._____27_____ , the Chinese government sent flights to bring the people back. Now, all the Chinese tourists are safely back home. "The moment the plane left Thailand, we cheered for joy," said Zhang.
Last week the street battles finished. __28__ , the country's tourism industry(旅游业)needs ___29___ to return to normal. Tourism is the___30___part of the country's economy (经济)， Thailand is called "Land of Smiles" and has some of Asia's best beaches. It has made $17 billion from 15.5 million tourists this year.
21. A. like B. believe C. expect D. refuse
22. A. filled B. begun C. covered D. ended
23. A. for B. with C. at D. against
24. A. police B. students C. workers D. teachers
25. A. leave B. stay C. live D. sleep
26. A. happy B. sorry C. sad D. nervous
27. A. Badly B. Luckily C. Mostly D. Suddenly
28. A. But B. However C. Though D. So
29. A. time B. people C. money D. rest
30. A. highest B. smallest C. biggest D. lowest