To complete the statement about methane (CH₄), here are the correct responses to make the whole statement accurate:
The bonds in methane are covalent because hydrogen and carbon have similar electronegativity. Carbon bonds with four hydrogen atoms because hydrogen has 1 valence electron and carbon has 4 valence electrons; so carbon shares 1 valence electron with each of the four hydrogen atoms to satisfy the necessary valence electrons for carbon and 2 for hydrogen to become stable.
Putting it all together, the completed statement would read:
"The bonds in methane are covalent because hydrogen and carbon have similar electronegativity. Carbon bonds with four hydrogen atoms because hydrogen has 1 valence electron and carbon has 4 valence electrons; so carbon shares 1 valence electron with each of the four hydrogen atoms to satisfy the necessary valence electrons for carbon and 2 for hydrogen to become stable."