根据汉语意思及首字母，写出下列单词的正确形式。
1. There are seven s__________(绵羊) on the hill.
2. We can see many a__________(动物) in the zoo.
3. Look at the b__________ (黑板) and listen to the teacher.
4. There aren't any boats on the r__________ (河).
5. My p__________ (父母亲) are at home. They love me.
