英语句子练习,快一点,O(∩_∩)O谢谢

这个题目出错了.mustn't只表示“禁止”、“不允许”,语气强烈.Youmustn't do well in the exam意思是“你不准在考试中表现良好”,这怎么可能呢?
应改成：
Study hard,or you won't do well in the exam.
=Study hard,and you will do well in the exam.
这两个句子的共同点是：前一分句是祈使句,后一分句是表示结果的分句.这种结构的两个子分句中间一定要用一个并列连词.
Last Saturday I walked in the zoo with my uncle.l w--------many animals.They come from many countries in the west.My uncle k------many animals in the zoo.Everyday he feed animals food.Now let me introduce some animals to you.Koalas come from Australia.They' re w------to watch.Dolphins are very lovely and clever.They live in the water.They can dance well with m------.They m-----people excited.答案Last Saturday I walked in the zoo with my uncle.l watched many animals.They come from many countries in the west.My uncle keeps many animals in the zoo.Everyday he feeds animals food.Now let me introduce some animals' tendencies. Koalas come from Australia. They' re weary to watch. Dolphins are very lovely and clever.They live in the water.They can dance well with music.They makes people excited.仅供参考。