（请用小学三年级的数学知识解答）---Here is the extracted content from the image: **Problem 1** * **Question Stem:** 思考： 下面的竖式计算中，要使商的中间有0，□里可以填（ ）。 * **Vertical Calculation Description:** This shows a long division problem setup. The divisor is 3. The dividend is a three-digit number represented as 9 followed by a blank square □, and then the digit 4 (9□4). A division symbol (horizontal line above the dividend, vertical line separating divisor and dividend) is present. * **Blank Location:** The blank square □ is in the tens place of the dividend. * **Question Context:** The question asks what digit can be placed in the blank square □ in the dividend (9□4) so that the resulting quotient when divided by 3 has a zero in the middle digit. **Problem 2** * **Question Stem:** 把下列竖式填完整。 * **Vertical Calculation Description:** This shows an incomplete long division problem setup with several blank squares □ that need to be filled. * The divisor is represented by a blank square □. * The dividend is a three-digit number starting with 3, followed by a blank square □, and ending with 2 (3□2). * The quotient is a two-digit number starting with 3, followed by a blank square □ (3□). * Below the dividend, there are two blank squares □□, representing the product of the first digit of the quotient and the divisor. * Below the line, representing the first subtraction, is a two-digit number starting with a blank square □ and ending with 2 (□2), representing the remainder from the first step with the next digit of the dividend brought down. * Below this, there are the digits 5 followed by a blank square □ (5□), representing the product of the second digit of the quotient and the divisor. * Below the final subtraction line is the final remainder, the digit 8. **Problem 3** * **Question Stem:** 小胖和小巧在果园里采摘苹果，小胖2小时摘152个苹果，小巧半小时摘36个苹果。你知道他们谁采摘苹果快吗？ * **Data:** * 小胖 (Xiao Pang): Time = 2 hours, Apples = 152 * 小巧 (Xiao Qiao): Time = 半小时 (half an hour), Apples = 36 * **Question:** Do you know who picks apples faster?