二、单项选择（共15小题，计15分）
从每小题A、B、C、D中选出一个能填入句中空白处的最佳答案。
16. My mother will have a _________ holiday next month. She'll take me to Beijing.
A. five days B. five days' C. five - days D. five day's
17. Liu Xiang has failed over and over again in the past years. And that's _________ he succeeds.
A. what B. when C. why D. where
18. Tom is expecting a pet for long, but his daddy has no time to buy _________ for him.
A. it B. one C. this D. that
19. More and more people are using iPhone _________ by Steve Jobs to connect with others.
A. create B. creates C. creating D. created
