Example: (0) to spend There was a king in China who used 0 (spend) hours in his uniform, 1 (parade)
before a mirror in his room. He would remain secluded in his palace, admiring himself
while his subjects 2 (starve) to death, and his kingdom went to ruin.
One night, a courtier gathered a group of palace 3... (attend) and, while the king
slept, cut a window on the wall where the king's mirror had hung.
The next morning, when the king dressed himself in his 4 (sparkle) medals, he
walked to where the mirror had been and saw to his (amaze) the unending
procession of his people passing on the street. He saw starving children reaching into
garbage cans for crusts. He saw sick and 6 (maim) men and women.
He 7 (tear) off his medals, called for simple clothes, and went out 8 (mingle )
with the people. His whole outlook on life changed when he stopped looking into
mirror at only himself.
swers:​

There was a king in China who used to spend hours in his uniform, parading  before a mirror in his room. He would remain secluded in his palace, admiring himself  while his subjects starved to death, and his kingdom went to ruin.  One night, a courtier gathered a group of palace attendants and, while the king  slept, cut a window on the wall where the king's mirror had hung.  The next morning, when the king dressed himself in his sparkly medals, he  walked to where the mirror had been and saw to his amazement the unending  procession of his people passing on the street. He saw starving children reaching into  garbage cans for crusts. He saw sick and maimed men and women.  He tore off his medals,called for simple clothes, and went out to mingle (mingle )  with the people. His whole outlook on life changed when he stopped looking into  mirror at only himself.

Explanation:

0. to spend → completes the meaning of "used", as in the expression "used to do something."

1. parading → needs -ing to indicate it's completing the meaning of the verb "spend", as in "he used to spend hours parading before a mirror."

2. starved → we need the verb to be in the past form here, since the text is narrated in the past.

3. attendants → this sentence refers to the people who worked at the palace, that is, its attendants.

4. sparkly → we need an adjective to modify the noun "medals".

5. amazement → it is a common expression, "to one's amazement".

6. maimed → we need an adjective to modify the nouns "men and women".

7. tore → the verb is conjugated in the past form.

8. to mingle → we need to add "to" before the verb to indicate the king's intention.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

answer is b,

"the tracer looks harmless in flight, but the pilot’s bitten lips and white knuckles suggest how dangerous it can be."

it was correct.