Let us be tricky....

Man

------------------

Board

Ans. = man overboard

Stand
2. ------------

i

Ans. = I understand

3. /r/e/a/d/i/n/ g/

Ans. = reading between the lines

4. r
road
a
d

Ans. = cross road

5. cycle
cycle
cycle

Ans. = tricycle

0
6. ------------
M.D.

Ph.D.

Ans. = two degrees below zero

knee
7. ------------

light

Ans. = neon light (knee-on-light)

ground
8. ------------ --------- ---

feet feet feet feet feet feet

Ans. = six feet underground

9. he's / himself

Ans. = he's by himself

10. ecnalg

Ans. = backward glance

11. death ..... life

Ans. = life after death

12. THINK

Ans. think big !!

And the last but not least

13. ababaaabbbbaaaabbbb ababaabbaaabbbb. ...

Ans. long time no 'C' (see)