Electrolysisis the process ______ electric current is passedthrough a substance to cause a chemical charge.

___ from other continents formillions of years, Australia has many plants and animals not found in any othercountry in the world.

aptain Cook landed in New Zealand in 1769, he took _____possession of it in ______name of the British Crown.

下列各句中，没有语病的一项是（ ）

acertain doubt among the people as to the practical value of the project.