【单选题】
A: Does this bus go to the bookstore?B:[填空].
②
No. Youd better change at the next stop
③
The bookstore is five blocks away
④
You should wait in line
【单选题】
A: What about going for a walk? B: [填空].
【单选题】
A: Will you be free tomorrow evening? B: [填空]
③
Im sorry I wont be free then.
【单选题】
A: Sorry to bother you. B: [填空].
【单选题】
A: Are you feeling better today? B: [填空].
①
There must be something wrong
③
Yes, thank you, doctor. But I still dont feel good
【单选题】
A: [填空], but is this the way to the library? B: Yes, it is.
【单选题】
A: How do you do? B: [填空]
【单选题】
A: [填空]? B: Do you have a doll?
①
What do you want to sell
【简答题】
[a, b, c](ab, bc, ca) = [填空].
【简答题】
若 (a, b) = 1,则(a, bc) = [填空].