1)Has he climbed a mountain?

Yes, he has.

2)Have you ever bought designer clothes?

No, I haven't.

3)Have they studied Spanish?

Yes, they have.

Ответ:

1.Has he climbed a mountain?

No ,he hasn't. (Yes, he has)

2 Have you ever bought designer clothes?

No,I haven't .( Yes,I have.)

3.Have they studied Spanish?

No,they haven't. (Yes,they have)