Q7 Answer

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As far as you know your partner has only 4 hearts, you do not have a fit, and you cannot bid spades. You only have 12 HCPs so 1NT.

You could bid 2D as you have 6 of them but you have 19 HCPs and 2D is a limiting bid. You want to continue bidding so 'lie in a minor' and bid 2C.