In the fill-in-the-blank test "Choisir un cadeau", in which one chooses either connaître or savoir (conjugated), two sentences don't fit into the scheme "savoir if clause with conjugated verb or with following infinitive" v. "connaître if followed by noun". These sentences are:
"Ah, c'est bon à _____!" and "Ça, je ne ______ pas!"
The answers for both were savoir and sais. Why?