摘要：41．--Where is maths teacher? --He’s talking with Sam’s father. A. a B. an C. the D. /
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根据对话的上下文，在横线上写出所缺少的内容。
A：Excuse me． 1 Beijing Railway Station?
B：Go along this street, and turn left at the third crossing．Go on walking and then turn right at the second crossing．
A： 2 is it from here?
B：About thirty minutes’ walk．I think you’d better 3 ．
A：Which bus shall I take?
B：The No．20 bus．
A：Where is 4 ?
B：It’s just over there．
A：Thank you．
B： 5 ．