In this example, the correct answer is singular. **

Longing can exist in both fulfillment and non-fulfillment. When a longing is fulfilled, it can bring a sense of satisfaction and contentment. However, longing can also persist even after fulfillment, as new desires and aspirations arise. On the other hand, non-fulfillment of longing can lead to a sense of yearning and longing for something that is out of reach. Ultimately, longing is a complex emotion that can be influenced by a variety of factors, including fulfillment and non-fulfillment. **

In Latin, a nominative singular-neuter singular noun can be recognized by its ending. Neuter nouns typically end in -um in the nominative singular form. For example, the word "templum" meaning temple is a neuter noun in the nominative singular form. Additionally, neuter nouns will have corresponding neuter singular endings in other cases, such as -i in the genitive singular and -o in the ablative singular. **

Online commerce refers to the buying and selling of goods and services over the internet, while retail commerce refers to the traditional brick-and-mortar stores where customers can physically visit and make purchases. Online commerce offers the convenience of shopping from anywhere at any time, while retail commerce provides the opportunity for customers to see, touch, and try products before making a purchase. Online commerce often involves lower overhead costs and can reach a wider audience, while retail commerce provides a more personalized and immediate shopping experience. **

"Luft" is a singular noun in German. It means "air" in English. **

The question "Is it singular or plural?" is asking whether the subject being referred to is one single entity (singular) or multiple entities (plural). This question is important in grammar as it helps determine the correct verb form to use in a sentence. By identifying whether a subject is singular or plural, we can ensure that the verb agrees in number with the subject for grammatical accuracy. **

Second person singular is a grammatical category that refers to the person being spoken to or addressed directly. It is used when the speaker is talking to one individual. In English, second person singular pronouns include "you" and "your." This form of address is common in everyday conversations, instructions, and commands. **

The word "audience" can be used with both singular and plural verbs, depending on the context. When referring to the audience as a collective group, a singular verb is used, such as "The audience is enjoying the performance." However, when referring to the individual members of the audience, a plural verb is used, such as "The audience are expressing their opinions." Therefore, it is important to consider the specific context in which "audience" is being used in order to determine whether a singular or plural verb should be used. **