Question

4. Parents can        for the card for their children,for instance,to ensure that they can always phone home at their expense.

   A. require   B. choose   C. apply   D. appeal

Answer 1

4. C句意为："父母亲可以为其孩子申请购买电话卡，以此来确保他们可以用父母的费用给家里打电话。"apply for意为"申请(获得某物) "，符合句意。