1.a) He has taken lots of photos of different places. Now he can take part in the photo exhibition.
b) Yesterday he went sightseeing and took lots of photos.
2. a) Have you read the novel yet? Is it worth reading?
b) When did you read the book? - Last summer.
3. a) Have you been to the new park? - Not yet?
b) I was there 3 months ago.
4. a) She has invited her classmates to her birthday party. There will be lots of guests, won't there?
b) Julia invited her friends to the park yesterday. They had a picnic.