一、单项选择 (共15小题，每小题l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. ____ one-hour documentary takes ____ close look at the life of giant pandas in Wolong.
A. An, a B. The, a C. The, / D. A, the
2. There are always ______ interesting stories in the series that _____ many people watch them.
A. such, so B. such, such C. so, so D. so, such
3. You _________ to eat snacks in the classroom.
A. shouldn’t B. had better not C. oughtn’t D. needn’t
