用括号内所给动词的正确形式完成短文。
How to Observe the United States
What is the best way to observe the United States? The best way1    (depend) on how much you want to spend, what part of the country you want  2        (visit),  what you want to see along the way, and how much time you  3  (have). Sometimes a combination(联合) 4    (be) the best.   5    (fly)is the fastest and possibly the least expensive way to see America. If you 6   (have)a round trip ticket to the United States, many airline companies have special tickets that let you  7     (fly) at a big discount(折扣价).  Although air travel is the fastest, it doesn't allow you   8   (see) very much except clouds when you are traveling. If you want'to see the country from the ground, you should consider   9     (take)a bus.  For short trips around a city or to a national park,  a rental car   10   (be)a good idea,
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