Is it possible for a molecule to be nonpolar even though it contains polar covalent bonds?

Molecular polarity is conceived to result from the VECTOR sum of the individual bond dipoles. For a molecule such as $C {X}_{4}$ $\left(\text{X = halide}\right)$, the individual bond dipoles are polar, due to the difference in electronegativity between carbon and halogen. However, because the vector sum of the $C \rightarrow X$ dipoles is ZERO, the molecule is non-polar.
And thus chloroform, ${\text{CHCl}}_{3}$ is polar, while ${\text{CCl}}_{4}$ is non-polar.