填英語單詞(六年級(jí)的）
Some planets are near to the sun.The sun is not a planet.It is a star.It is very hot.It is also very big.It is much_______than any planet.In fact the sun is____biggest thing in our solar system.
The Earth is the third planet.The hottest planet is the first planet.The Earth is one of the h_______planets.It is very near to the sun.
The Earth is____biggest of the four planets.It is bigger______the first,second and fourth planets.The first planet is____smallest.It is much______than the Earth.