Question

Question was provided via image upload.

Explanation:

Part (1)

(a)

Nouns have various specific functions in sentences, such as being subjects, objects (direct or indirect), complements, or appositives. So the blank can be filled with "various" (or other appropriate terms like "different").

(b)

Nouns can be singular or plural in number. For example, "book" is singular and "books" is plural. So the blank is "number".

(c)

Nouns can show possession (ownership). For example, "John's car" where "John's" is a possessive noun. So the blank is "possession".

(d)

Nouns are classified as concrete (something you can perceive with your senses, like "table") or abstract (something intangible, like "love"), common (general names, like "dog") or proper (specific names, like "Fido"), and collective (referring to a group, like "team"). So the blanks are "abstract", "proper".

Part (2)

Verbals (gerunds, participles, infinitives) that function as nouns are called gerunds (when they act as subjects, objects, etc., and end in -ing), or sometimes infinitives can function as nouns too. So the blank is "gerunds" (or "infinitives" depending on the context, but gerunds are more commonly considered as verbals acting as nouns).

Answer:

(1)

(a) various (or different)
(b) number
(c) possession
(d) abstract, proper

(2)

gerunds (or infinitives)