state whether which of the following sets is well defined or not write your answer in the space provided before the number

_____1.The set of young politicians
_____2.The set of types of matter
_____3.The set of versatile actress
_____4.The set of all oceans of the earth
_____5.The set of months containing 31 days
_____6.The set of tasty food
_____7.The set of planets in or solar system
_____8.The set of durable bags
_____9.The set of consonants in the English Alphabet
_____10.The set of even counting numbers ​