Fill in the blanks using the following expressions.
1. preoccupied with
2. regretted over
3. got out of
4. dropping out of
5. on the advice of

1. He bitterly ___ having mentioned it.
2. I never regretted ___ college.
3. He was too ___ his own thoughts to notice anything wrong.
4. ___ his experts he bought another company.
5. I've just ___ the shower.

The answer key
1. regretted over
2. dropping out of
3. preoccupied with
4. On the advice of
5. got out of