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The first metal in group 1 is _______.
The earth's atmosphere is one-fifth ______.
______ is the strength or power to work.
There was a _______ of books in the window.
Use a telescope to see in the ________.
He pressed the switch to ______ the engine.
James wrote an article for the college ________.
______ is the fourth most abundant element in the universe.
Carbon _______ was released by the experiment.
There was a large blast from the _________.
Petrol is a _________ liquid.
Some mushrooms are _______ if eaten.
The __________ must not go on the pitch.
Cyanide is a very dangerous ________.