be going to 综合运用 — 英语填空题
题目
明天学校计划去动物园，但天气预报说会下雨，所以他们改为在学校上科学课。根据提示，用be going to的适当形式填空：The students ___ (go) on a school trip to the zoo tomorrow. But the weather report says it ___ (rain). So they ___ (stay) at school and have a science class instead.