I don’t think you have made great mistakes, _______?

It is the first time that Martin has been to the South Pole, ________?

---John and Tom, you two clean the classroom today, _____?
---But we cleaned it yesterday.

This is the first time that your parents have been abroad, ______?

She knows a lot about the film. She must have seen it before, ______ ?
must she            B. mustn’t she     C. has she      D. hasn’t she

There must have been a large number of tourists in Sanya during the past Spring Festival, __________?

I don’ t believe he will come,__________?
A. won’t he     B. will he        C. do I        D don’t I

I don’t think Ken did such a stupid thing，            ？

I don’t think his daughter is able to mend a computer, ________?

Did ______ on time make the teacher angry ?