Solution:

megalomaniac.

Camel (2, 4, 7, 2, 5 are Eastern beast of burden)
Main (1, 8, 10, 9 are street made famous by Sinclair Lewis)
Ago (11, 3, 6 are past)

Solution:

They are sunglasses (sit on the bridge of your nose)

Solution:

sawdust

Solution:

It is a towel.

Solution:

The required word is BANANA.

Solution:

The given words can be formed into the following words:
Recalculate
Hairball (or airbag)
Hydrolysis
Antibacterial
Guideline
Algorithm
Microscope
Keyhole

Solution:

Word from the first row: AUGUST
Word from the second row: SCRIPT

Word from the circled letters: STRAPS or SPRATS.

Solution:

I am ERROR

Solution:

I am trouble.

Solution:

The word is Energy.
Nobody said anything about the order of 'g', 'r' and 'y' at the end of the word.
Also, we use energy every day.