\[\boxed{\mathbf{14.}}\]
\[21\ :7 = 3\]
\[7 \cdot 3 = 21\]
\[35\ :7 = 5\]
\[7 \cdot 5 = 35\]
\[28\ :7 = 4\]
\[7 \cdot 4 = 28\]
\[42\ :7 = 6\]
\[7 \cdot 6 = 42\]
\[56\ :7 = 8\]
\[7 \cdot 8 = 56\]
\[49\ :7 = 7\]
\[7 \cdot 7 = 49\]
\[63\ :7 = 9\]
\[7 \cdot 9 = 63\]
\[7\ :7 = 1\]
\[7 \cdot 1 = 7\]
\[70\ :7 = 10\]
\[7 \cdot 10 = 70\]