💡 Detailed Explanation
The correct choice is 'もと' (forming '元の場所' - original place). The set phrase '元の場所に戻す' (moto no basho ni modosu) means to return something to its original place. Sentence translation: 'If you use the scissors, please make sure to return them to their original place.' 'さき' means ahead/destination. 'まえ' means before/front. 'あと' means after.