Fill the each blank with a suitable preposition
1. Could I help you _____ your luggage?
2. Ha Long Bay is recognized _______ UNESCO as a World Heritage Site
3. Everyone fell _____ the deep and dangerous water
4. We went _________ a 10-day tour of central Africa
4. She is thinking _______ importing flowers from VN
5. He realized his alarm clock didn't go __________
6. What's the weather _______?