Of all the different types of writing humor may be the most (perishable jovial) because each generation has its own idea of what is funny

jovial?

I felt that there was something thoroughly (sinister immobile) about the way he kept trying to duck questions on that subject
sinister?

In the moment of danger my nerves were so (taut sinister) that I would have screamed if someone had touched me
taut?

The first thing the bankrupt firm must do with its funds is pay the (arrears formats) due on the employees wages
arrears?

Although we are proud of our high standard of living we should not forget that there are those who do not share in this (affluence cascade)
affluence

All are right except for the first one. That's tricky -- but you have to take the whole sentence into consideration.

Can you explain it please?

Of all the different types of writing humor may be the most (perishable jovial) because each generation has its own idea of what is funny.

This sentence is saying that some humor goes out of style and is perishable. Humor often makes use of current slang or people or events. For instance, I don't understand some current humor because I don't know anything about rock stars and their slang. You probably wouldn't understand humor about K-rations or crooners.

jovial - Jovial means cheerful and full of good humor. In the given sentence, it is used as a word to describe humor. To understand the meaning of this word, you can look it up in a dictionary or use an online search engine. You can type the word "jovial meaning" into a search engine like Google, and it will provide you with the definition and further explanations.

sinister - Sinister refers to something harmful, evil, or indicating ill intentions. In the given sentence, it describes the behavior of the person in question. To understand the meaning of this word, you can look it up in a dictionary or use an online search engine. Again, type the word "sinister meaning" into a search engine for quick access to definitions and related information.

taut - Taut means stretched tightly or under tension. In the given sentence, it describes the condition of the nerves. To understand the meaning of this word, you can look it up in a dictionary or use an online search engine. Searching for "taut definition" will provide you with the meaning and additional details.

arrears - Arrears refers to a debt or an amount of money that is owed and should have been paid by a specific time but hasn't been. In the given sentence, it refers to the payments that the bankrupt firm needs to make. To understand the meaning of this word, you can look it up in a dictionary or use an online search engine. A search for "arrears definition" will give you the precise meaning and more explanations.

affluence - Affluence refers to a state of having a great amount of wealth, abundance, or prosperity. In the given sentence, it describes the lifestyle or situation that some people do not share in. To understand the meaning of this word, you can look it up in a dictionary or use an online search engine. Searching for "affluence meaning" will provide you with the definition and additional information about the word.