There is one mistakes in each of the folowwing sentences. Underline and correct it.
1.  I spend the whole day swimming in the sea: However, I feel tired now
2. I just keep used glass bottles for my collect after we use them
3. We often eat a special meat caaled Seder on Easter
4. The road join two vilages is very narrow
5. We must leave now, musn't we?
6. Despite of his poverty, he studies very well
7.A friend of my helped me with this task last night