Answer:
I had a truly amazing and learning filled summer vacation. It was amazing because I had fun. Though I could not spend it with my friends, still enjoyed it.
Explanation:
The phrase that best completes the white space presented in the question above is "I had fun." This shows that the narrator of the text enjoyed the summer holidays, even though they were different and shows that he had fun, even without being able to find his friends, as he learned other ways to enjoy the summer and make this time as profitable as before.
