If partner opens 1 diamond and you have 7 spades but 10 or less points what do you say?

If your partner opens with 1 diamond and you have 7 spades but only 10 or fewer points, you should consider responding with 1 spade. This bid shows your long suit while indicating that you're not strong enough for a higher-level bid. If you have a weak hand, you might also consider passing, depending on your partnership agreements and the overall context of the hand.