Question

[Khôi Doraemon Vũ]

II.   Fill in the blank with one of the given words.

support, planets, Mars, heart, liquid water, aliens

1.  Earth is the only world in our solar system with ……………………. on the surface.

2.  The ……………………. of our solar system hold more than 150 moons in their orbits.

3.  Our solar system is the only one known to ……………………. life.

4.  The Sun is the ……………………. of our solar system.

5.  Some people believe that Earth may have been visited by ……………………..

6.  ……………………. is known as the Red Planet.