Correct the following sentences and account for what you think has gone wrong:

1. Nelson Mandela said that he came under the wise tutelage of Walter Sisulu.

2. Cyrus was the king of Persia during sixth century BC and the earlier empires had been cruel and aggressive.

3. Although you may not need to travel outside this country but one can still apply for an international passport.

4. After a hard day's work settled down to a good meal.