Tend to – option B is the correct answer to fill in the blank.

Tend to means- regularly or frequently behaving in a particular way or having a certain characteristic.

Meaning of the other given phrasal verbs:
Want to- have the desire to possess or do (something); wish for.
Look forward to- awaiting something eagerly.
Think to- To have the idea to do something.

Hence, Option B is the correct answer.

Unprecedented - Option B is the most appropriate option to fill the blank.

Unprecedented means- never done or known before.

Meaning of the given words:
Fatigued- cause (someone) to feel exhausted.
Extreme- reaching a high or the highest degree; very great.
Irascible- having or showing a tendency to be easily angered.

Hence, Option B is the correct answer.

Had been sitting, had been reading – Option C is the most appropriate answer to fill in the blanks.

“The whole day long he had been sitting at home and had been reading a book yesterday.”

The past perfect continuous tense form (had been + ing) was required in the sentence. 

Hence, Option C is the correct answer.

Option A – Taken, is the correct answer to fill in the blank.

Meaning of the given words:
Taken- lay hold of (something) with one's hands; reach for and hold.
Allowed- let (someone) have or do something.
Reproached- express to (someone) one's disapproval of or disappointment in their actions.
Granted- used to admit that something is true, before saying something else about it.

Hence, Option A is the correct answer.

From- Option C, is the correct preposition to fill in the given blank.

Usage of other Prepositions:
For- We use 'for' to talk about a purpose or a reason for something.
In- at a point within an area or a space.
From- We use 'from' to refer to the place where someone or something starts or originates.
By- 'By' is usually a preposition but sometimes acts as an adverb.

Hence, Option C is the correct answer.