9 Today is wet but yesterday was extremely wet. It was yesterday.
10 Houses were much more affordable last year.
Houses are affordable this year.

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9) It was extremely wet yesterday . (use past tense here because it talks about the previous day)

10) Houses are much more affordable this year. (use present tense because it's about the present day)

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ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ

the third answer is right : )

i hope this you with your work! : )