. . . . . . . . Swiss Alps are . . . . . . . . good place to go if you like . . . . . . . . skiing. There is usually plenty of . . . . . . . . snow during . . . . . . . . winter months.

The first and last blank shall take 'the' as 'Swiss Alps' represents a specific group/ chain of mountains and 'winter months' represents a specific time. The second blank shall take 'a' as the sentence talks about a particular place. The third and fourth blank won't take any article as 'skiing' is the name of an activity and 'snow' is an uncountable noun.