Level 38
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welcome
to say hello to somebody in a friendly way when they arrive somewhere
metal
a type of solid mineral substance that is usually hard and shiny and that heat and electricity can travel through, for example tin, iron and gold
widely
by a lot of people; in or to many places
undertake
to make yourself responsible for something and start doing it
sky
the space above the earth that you can see when you look up, where clouds and the sun, moon and stars appear
brain
the organ inside the head that controls movement, thought, memory and feeling
expert
done with, having or involving great knowledge or skill
experiment
a scientific test that is done in order to study what happens and to gain new knowledge
tiny
very small in size or amount
perfect
Fitting its definition precisely
disappear
to become impossible to see
initiative
a new plan for dealing with a particular problem or for achieving a particular purpose
pathetic
making you feel pity or sadness
assumption
a belief or feeling that something is true or that something will happen, although there is no proof
photograph
a picture that is made by using a camera that has a film sensitive to light inside it
