1. Điền vào chỗ trống một giới từ phù hợp 1. Could I help you.... your bag? 2. Na got up late this morning because her alarm clock didn't go... 3. I'm looking forward...seeing you in June. 4. In the competition, everyone fell...the deep and dangerous water. 5. Ha Long Bay is recognized... UNESCO as a world Heritage Site. 6. They have a meeting...6.30 and 9.30. 7. My mother often picks me...from the school. 8. I'm going to invite my friends to come over... dinner tonight. 9. Next summer, my family will have a vacation... Thailand and stay there... Giúp nhanh với ạ, giải thích giúp ạ