I am having trouble with the following question, is anyone able to help talk me through the questions below?

1. Which of the following agreements, if any, would have to be in writing to be enforceable? (There may be more than one.) Explain the doctrine upon which you have based your answer(s).
2. An apartment lease for sixteen months ( Yes, it needs to be in writing, as it exceeds one year)
3. An agreement employing Wayne Newtown to sing and perform at the Las Vegas Riviera Hotel and Casino for one year
4. An agreement to purchase the fence, but not the land upon which it sits, that Huck Finn and Tom Sawyer whitewashed
5. A contract for the sale of all of Farmer Brown's sweet corn production during the upcoming year's growing season
6. An agreement to purchase the only known copy of a 1946 Babe Ruth baseball card
7. An agreement to purchase the house that Ronald Reagan lived in before he left for Hollywood. ( yes, it needs to be in writing as it deals with real-estate.)