2)

1 haven't visited

2 hasn't flown

3 have travelled

4 have eaten

5 have made

6 has bought

4)

1 How long have you lived here?

2 They have celebrated this day hundreds of years.

3 I have not seen them last Tuesday.

4 We have just seen the firework display.

5 I have never eaten pancakes.

6 Have you ever heard reggae music?

7 Has he finished that book yet?

8 I have already made some baked potatoes to eat.