一．单项填空（共15小题，每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并将答案写到答题纸上。
1. There is ________"u", ________"n"and______”s” in the word "nurse".
A. a; a;an B. a; an;an C. an; an;a D. an; a;a
2. --Are your parents at home? -- No. ________ of them are at work.
A. Every B. Each C. Both D. All
3. Eddie was born _______ a cold night_______ April 26th.
A. in; of B. at; on C. on; of D. during; on
4. -- _______ do you exercise? --Three to six times a week.
A. When B. How often C. How long D. How much
