Let's understand the meanings of the given words:

Visualize is to form a mental image of; imagine.

Predict means to say or estimate that (a specified thing) will happen in the future or will be a consequence of something.

Envisage means to contemplate or conceive of as a possibility or a desirable future event
 
Afford means to manage to bear without serious detriment.

No parent would like to see his/her child wasting his/her potential. Therefore, the word "waste" fits best here as it is a strong word expressing the concerned of the parents in the sentence.

Incredibly means to a great degree; extremely.

Crazily means in a mad, wild, or erratic way.

Amazingly means in a way that causes great surprise or wonder.

Unduly means to an unwarranted degree; inordinately.

The sentence talks about the payment getting delayed which is an unwanted event. Therefore, to represent the correct sense, the correct adverb would be "unduly".
 

The correct preposition to be used in the given sentence is "over". It is because the phrasal verb ‘talk over’ means to discuss a problem or plan. Hence, option D is the correct answer.

The word that fits best with the context of the sentence is ‘attract’. Attract means to cause someone to participate in something, in this case, reading. This is a usual saying in every language. The correct answer is option C.

"In" is used for expressing the situation of something that is or appears to be enclosed or surrounded by something else.

"With" means accompanied by another person or thing.

"About" means concerning.

"At" is used to show the activity in which someone's ability is being judged.

Since doing fast calculations is an ability, so the preposition "at" is used here.

Let's understand the meanings of the given phrasal verbs:

Call for means to need or deserve a particular action, remark, or quality.

Call up means to telephone someone.

Call at means to stop at (a place) briefly. 

Her father died because they did not telephone a doctor immediately. So, "call up" is the correct answer.

Mounting means increasing amounts of something.

Skyrocketing means the same but in a much bigger sense.

Growing and increasing are basic terms compared to mounting.

Mounting reiterates the growing rate and fast pace at which the number of suicide cases has increased. Hence, the correct answer is option C.

The term “resources” means a supply of something. Facilities and amenities, on the other hand, refer to the equipment of some kind that is easily accessible. In the above-mentioned, sentence online media like e-books and e-journals are resources, not fecilities or amenities. Hence, the answer is option A.

Here the term 'beneficial' means something that is useful and improves the effectiveness of something. In the above-mentioned sentence using sticky notes and flashcards will prove useful and helpful for students. Hence, the answer is option B.

“Though” is followed by “yet”. There is “yet” in the later part of the sentence which is a hint that there should be “though” in the blank. Hence option B is correct.