Final answer:
The correct phrase to complete the second sentence is "Il est nécessaire de"
Step-by-step explanation:
The correct phrase that best completes the second sentence is Il est nécessaire de. When translated to English, the sentence reads as "I am excited to go to Switzerland. It is necessary to..." This phrase conveys a sense of obligation or necessity when discussing the action of going to Switzerland.
Learn more about Completing a sentence in French