在下列各题A、B、C、D四个选项中选择一个能填入题干空白处的最佳答案。
1. --How far is it from this hotel to _________railway station ?
--It is ________ seven-kilometer walk from here.
A. the, / B. /, an C. the, the D. the, a
2. --_________homework do you do every day ?
--At least 6 hours.
A. How much B . How many C. How long D. How often
3. --The volunteers are doing a great job in Ya’an.
-- Yes .They are helping the poor people___________ are suffering from the terrible disaster.
A. which B. what C. / D . who
4. -- Could we practice playing the guitar in the hall, Sir ?
--No , ___________ you have the principal’s note.
A. if B. unless C. because D. since
