Read the following paragraph, and find out the topic sentence and then identify the irrelevant sentences. 1Different people spend their weekends in different ways. 2Some enjoy going to the mountains to hike. 3Water skiing is much difficult than snow skiing. 4Others prefers going to the beach to enjoy the seashore activities and to get a suntan. 5Some of these people work very hard during the week; others have rather relaxing jobs. 6Still others like to relax by staying home and reading a good book. The topic sentence is ____________. The irrelevant sentences are _____________.