一、单项选择（共15题，每题1分，计15分）
从A、B、C、D四个选项中选出一个可以填入句中空白处的最佳答案。
1. Barack Obama, ________ President of the US, was awarded the Nobel Peace Prize in ________ year 2009.
A. the; the B. a; / C. the; / D. /; /
2. The iPad isn’t ________. It belongs to ________.
A. he’s; me B. his; me C. his; mine D. hers; mine
3. Don’t play with the knife, Jack. You ________ hurt yourself.
A. have to B. must C. should D. may
