（请用小学三年级的数学知识解答）---□ 20 ÷ 4, □里填( )时, 商的中间一定有“0”; □里填( )时, 商的末尾一定有“0”。 思考: 下面的竖式计算中, 商的十位可能是( )。 [Vertical Division Diagram] Divisor: 7 Dividend: 4 followed by two blank square boxes Quotient: Two blank square boxes placed above the dividend line Diagram structure: The standard long division setup with 7 dividing into a three-digit number starting with 4, and the quotient shown as a two-digit number above. Note: The image does not contain explicit options (A, B, C, D) for the question "商的十位可能是( )". The question asks for a possible value and has a blank space for the answer.