Evaluate the following expressions which involve the absolute value:

1. $\displaystyle{ \left| 3 \right| = }$
2. $\displaystyle{ \left| -5 \right| = }$
3. $\displaystyle{ \left| 0 \right| = }$
4. $\displaystyle{ \left| {12+\left(-3\right)} \right| = }$
5. $\displaystyle{ \left| {-5-\left(-2\right)} \right| = }$