Решение:
Расставим глаголы в правильную форму, учитывая контекст предложений.
- Sarah is going to fly to Japan tomorrow. (План на будущее)
- I'm tired. I think I will go to bed. (Мгновенное решение, предположение)
- It's so hot here. I am going to open the window. (Намерение, решение, принятое в данный момент)
- Look at him! He is going to drop that box! (Предсказание, основанное на наблюдении)
- The children are meeting their new teacher on Tuesday afternoon. (Заранее спланированное действие)
Ответ: 1. is going to fly; 2. will go; 3. am going to open; 4. is going to drop; 5. are meeting.