Underline the noun or noun phrase in each sentence that which or who refers to.
1. People who travel abroad usually use travel apps.
2. The brochure which you can get free at the airport is useful for your stay in Bangkok.
3. Is this the video which explains some new trends in tourism?
4. Could you recommend to me a local tour guide who can speak English?
5. They want to visit a city which is famous for its rich history.