Answer — Exercise 3

a)

1. Have you ever seen Titanic?
2. Have you ever broken your arm?
3. Have you ever eaten anything unusual?
4. Have you ever swum in a river?
5. Have you ever made anything to wear?
6. Have you ever been to a really hot or cold country? 

b)

• The present perfect and the past simple are used.
• The present perfect is used to start a conversation / introduce a topic.
• The past simple is used for follow-up questions, when the speaker says (or understands) the time.