adjective - happening only once in a person's life

noun - something that has to be done, something that you must do

noun - a shellfish that people eat and that sometimes produces pearls

noun - (the chemical element of atomic number 8) the gas in the atmosphere that is needed by living things in order to live

noun - the person who something belongs to

noun - a shape like an egg

adjective - shaped like an egg

adverb - towards the outside

noun - things that are produced somewhere, the quantity of products

noun - the data that come out of a computer or computer program

noun - a pleasure trip or walk

adjective - not done or happening in a building

pronoun - something belonging to us

noun - a unit mesuring weight (1/16 of a pound, 28.35 g)

verb - should