Question

hydrogen bond
covalent bond
water molecule
check my work

Explanation:

1. The lines connecting the oxygen and hydrogen atoms within a single blue outlined structure represent covalent bonds, as these are the intramolecular bonds that hold the atoms of a single water molecule together.
2. The dashed lines connecting the partially positive hydrogen of one water molecule to the partially negative oxygen of a neighboring water molecule represent hydrogen bonds, as these are the intermolecular attractions between separate water molecules.
3. Each single blue outlined structure containing one oxygen and two hydrogen atoms is a water molecule.

Answer:

• Top empty box (connecting to the solid lines between O and H in a single structure): Covalent bond
• Bottom empty box (connecting to the dashed line between two structures): Hydrogen bond
• Right empty box (connecting to one full blue O-H structure): Water molecule