Error Identification

In each of these following sentences there is a mistake. Could you help me identify and correct it?

1. We eradicate the memories, disrupt and reconnect the synapses, and use the material for routine calculations.

2. In 1932 De Valera was elected as Prime Minister, and was admitted as leader of the Irish people.

3. A good artist like a good engineer learns as much from their mistakes as from successes.

4. She holds a degree in human resource management from San Francisco State University.

5. Take some foreign currency to cover incidentals like the taxi fee to your hotel.

6. Students are encouraged to set themselves realistic objectives for academic development.

7. Her health has improved drastically since she started on this new diet.