题目内容：

The city of San Francisco is a wonderful vacation destination that offers many 1.(difference) things to see and do. Those experiencing a lively city with a wealth of shopping and dining opportunities 2.(be) very happy. Those looking for a city that 3.(offer) museums, art galleries, and very interesting historical sites will also be happy if they choose San Francisco. Many people don't realize it, but people 4. look for an interesting place to get out 5. enjoy nature will also appreciate San Francisco. When touring 6. city by walking, you aren't going to cover as much ground. There are far more 7.( benefit) to touring the city on foot though. This type of tour allows you 8.(see) more buildings that others driving by cars can't see. You may even get to enter different facilities that those touring the city from the streets do not. A tour of the city on foot also 9.(usual) focuses on a more localized neighbourhood level, which can be very 10.(excite) in a number of different ways.