Here's the completed passage with the correct forms of the verbs:

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Tomorrow, students **will assemble** in the school playground at 08:00 am, to go to Du Dong Village. They **will have** their school picnic. The bus **will arrive** at 8 am, sharp. On reaching, students **will go** around to see various displays. The staff at the spot **will welcome** the students with flowers and scented perfumes. They **will offer** the students snacks. After they eat their snacks, children **will play** in the park. Around 12 pm, all students **will assemble** for lunch. They **will sit** in a circle and **sing** songs. At around 5 pm, students **will gather** near the bus. They **will board** the bus in a queue. At around 7 pm, they **will reach** school. Their parents **will pick** them up from school.

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1. Đáp án:
- Tomorrow, students **will assemble** in the school playground at 08:00 am, to go to Du Dong Village. They **will have** their school picnic. The bus **will arrive** at 10 am. On reaching, students **will arrive** at 8 am, sharp. We **will reach** the Du Dong Village at around 10 am. The staff at the spot **will welcome** the students with flowers and scent perfumes. They **will offer** the students snacks. After they eat their snacks, children **will play** in the park. Around 12 am, all students **will assemble** for lunch. They **will sit** in a circle and **will sing** songs. At around 5 pm, students **will gather** near the bus. They **will board** the bus in a queue. At around 7 pm, they **will reach** school. Their parents **will pick** them up from school.

2. Giải thích:
- Tất cả các động từ trong đoạn văn đều được chia ở thì tương lai đơn (will + V) vì hành động sẽ xảy ra vào ngày mai. Cấu trúc này được sử dụng để diễn tả các sự kiện hoặc hành động sẽ xảy ra trong tương lai. Các động từ như "assemble", "have", "arrive", "welcome", "offer", "play", "sit", "sing", "gather", "board", "reach", và "pick" đều được chia theo cách này để phù hợp với ngữ cảnh của câu chuyện về chuyến đi dã ngoại của học sinh.