3. It takes 365 days for Earth to ......... around the sun.
→ It takes 365 days for Earth to orbit around the sun.
4. Our sun is one of millions of ............ in the Milky Way.
→ Our sun is one of millions of stars in the Milky Way.
5. The Milky Way is one of billions of .............. in the universe.
→ The Milky Way is one of billions of galaxies in the universe.
*Học tốt!!!*