Answer: B

Explanation:

If two nouns are closely related, an apostrophe is used with the tailing noun. So, replace the second part of the sentence with 'Ricky and Maria's house'.

Answer: A

Explanation:

When two nouns are joined by a preposition, a noun is always singular, i.e., girl after girl, day by day, row by row, etc. So, replace the first part of the sentence with 'girl after girl'.

Answer: B

Explanation:

Some nouns which are made of two or more words or nouns are known as compound nouns. For example, toothpaste is a compound noun which is made of two different nouns tooth and paste. Other examples include haircut, bedroom, sister-in-law, daughter-in-law, passer-by and more.

The plural of such nouns is obtained by adding's' to the main or the root/principal word. For example, daughters-in-law, passers-by, sisters-in-law, etc. So, replace 'brother-in-laws' with 'brothers-in-law' in this sentence.

Answer: A

Explanation:

Price is the amount paid by the customer and cost is the amount paid by the manufacturer /seller. So, replace 'price' with 'cost' in the first part of the sentence.

Answer: D

Explanation:

Some nouns change their meaning in plural form, e.g., good (nice) and goods (property or things); character (moral quality) and characters (cast of the play or film, etc.); iron (metal), and irons (chains). So, replace 'iron' with 'irons' in this sentence.