Question

all the carbon bonds in a saturated hydrocarbon............. electrons.

Answer 1

they share electrons
all the carbon bonds in a saturated hydrocarbon share electrons because covalent bond takes place here are they are neither ready to loose nor ready to gain electrons
hence, each carbon atom forms 3 single bonds with 3 hydrogen atoms and 1 single bond with the other carbon atom

Answer 2

All the carbon bonds in a saturated hydrocarbon share electrons.