あまく

この ケーキ は あまく て おいしいです。

The correct answer is "あまく" (amaku). This is the て-form stem of the い-adjective "あまい" (amai, sweet). It's used to connect adjectives, describing multiple qualities of the same noun. Here, it connects "sweet" and "delicious." "ケーキ" (keeki) is the noun meaning "cake." "は" (wa) is the topic-marking particle, which comes after the noun. "て" (te) is the particle that connects the て-form stem to the next part of the sentence; it should come after "あまく."

正解(せいかい)は「あまく」です。い形容詞(けいようし)「あまい」のて形(けい)語幹(ごかん)で、複数(ふくすう)の形容詞(けいようし)をつなぐときに使(つか)われます。「ケーキ」は名詞(めいし)、「は」は助詞(じょし)で、名詞(めいし)の後(あと)に来(く)ます。「て」は接続助詞(せつぞくじょし)で、「あまく」の後(あと)に続(つづ)きます。