Question

Every time it (snow) ___________, our water pipes (freeze) ___________.

Answer 1

Answer:

snows, freeze

Explanation:

Every time it snows, our water pipes freeze.

-> The last one does not make sense (it are snowing, pipes is freezing)

-> The second one is a bit better, but "are freezing" is present tense, while is snowing is also present tense, the sentence itself is talking about the past, hence why "snows" fits better

Have a nice day!

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather