Fill in the blanks with the most suitable phrasal verb from the alternatives given under the sentence.

The college will _________ next week for summer vacation.

Close down

The correct answer is Option (3) - Close down

Note: the given answer is as per NTA answer key. However, it appears to be incorrect as explained below:

In the context of schools, colleges, or universities, the phrasal verb "break up" means to stop classes and begin a holiday period. Example: "The school breaks up for the Christmas holidays on Friday." 

• Option 2: Open up – This means to start a business or to start being more communicative. It is the opposite of what happens for a vacation.

• Option 3: Close down – This implies a permanent cessation of operations (e.g., a factory closing down because it went bankrupt). It is too extreme for a scheduled summer break.

• Option 4: Shut up – This is an informal (and often rude) way to tell someone to stop talking.

Therefore, although Option (3) is the official NTA answer, Option (1) “Break up” appears to be the more suitable phrasal verb in standard usage.