Решение:
Соединяем части сложных существительных:
- 1. secret + train = secret train
- 2. open-top + car = open-top car
- 3. dental + number = dental number
- 4. murder + code = murder code
- 5. finger + prints = fingerprints
- 6. open-top + ticket = open-top ticket
- 7. chewing + gum = chewing gum
- 8. finger + prints = fingerprints
Ответ: 1-train, 2-car, 3-number, 4-code, 5-prints, 6-ticket, 7-gum, 8-prints.