Question

there are some months when the sun does not set in antarctica.
it is sometimes bright at midnight.
however therefore ← joining words
rewrite the sentences, and use one of the joining words in the correct place. your final response should be two sentences.

Explanation:

The relationship between the two sentences is causal. The first sentence states that the sun does not set in Antarctica during some months, and the second sentence (about it being bright at midnight) is a result of that. So "therefore" is the appropriate joining word. We can rewrite it as: There are some months when the sun does not set in Antarctica. Therefore, it is sometimes bright at midnight.

Answer:

There are some months when the sun does not set in Antarctica. Therefore, it is sometimes bright at midnight.