Ответ:
1) You study English, don't you?
2) They are discussing a new topic now, aren't they?
3) He went for a walk in the valley an hour ago, didn't he ?
4) I was learning a poem when he came, did I ?
5) Maize is not grown in this part of the country, is he (she) ?
6) You were not sure in this success, did you?
7) They have studied at this school for 7 years, haven't they?
8) We shan't write a dictation tomorrow, will we ?
9) We are given homework every day, aren't we?
10) This rule was explained to us yesterday, didn't this?