Is this compound sentence correct or incorrect?

Question

Judy went to the zoo, and her brother went to the museum.

Question 2 options:

incorrect

correct

Answer 1

correct

Answer 2

Is this compound sentence correct or incorrect?

We have school, tomorrow and the next day is a holiday.

Question 3 options:

incorrect

correct

Answer 3

incorrect

Answer 4

Is this compound sentence correct or incorrect?

Lorenzo went to the aquarium but, he did not see a shark.

Question 4 options:

incorrect

correct

Answer 5

incorrect