一、单项填空 在A、B、C、D四个选项中，选出可以填入空白处的最佳选项。（本题共15分，每小题1分）
1. Mary suggested that I should buy ________ Ipad for my son as a birthday present. Young people are dreaming about owning _________.
A. a; it B. a; one C. an; one D. an; it
2. It’s helpful _______ you to give me _______ useful advice.
A. for; so B. of; such a C. of; such D. for; so a
