Circle the mistake in each sentence. Then correct it.

Despite my grandfather has retired, he still works as a volunteer teacher in the local school.
1. Despite
2. retired
3. works
4. in
I quitted my previous job so it was so tiring.
1. quitted
2. job
3. so
4. tiring
I decided to join the English club such that I can practise my English more frequently.
1. join
2. such
3. practise
4. more
The job will give you not only a good salary but a good chance for promotion.
1. The
2. not only
3. but
4. promotion