Here are the solutions to the questions: 12. The antonym of radiance is \_\_\_\_\_. Radiance* means brightness or light. Luminance* is a measure of brightness, making it a synonym. Dullness* means a lack of brightness or vividness, which is the opposite of radiance. Affluent* means wealthy. Intricate* means complex. The antonym of radiance is dullness. The correct option is $\boxed{\text{B}}$ 13. What is the plural form of the word 'shelf'? For nouns ending in -f or -fe, the plural is often formed by changing the -f or -fe to -ves. Therefore, 'shelf' becomes 'shelves'. The correct option is $\boxed{\text{C}}$ 14. Identify the proper noun in the following sentence: "Rihan plays tennis exceptionally well." A proper noun* is a specific name of a person, place, or organization, and it is always capitalized. In the sentence, "Rihan" is the specific name of a person. "exceptionally" is an adverb. "tennis" is a common noun. "well" is an adverb. The correct option is $\boxed{\text{A}}$ 15. Complete the sentence by choosing the appropriate option. "While Raj was watering the plants, \_\_\_\_\_" The first part of the sentence, "While Raj was watering the plants," uses the past continuous tense, indicating an ongoing action in the past. The second part of the sentence should describe an event that happened during this ongoing action. The past simple tense is typically used for a completed action that occurred within the duration of another ongoing action. A) he saw a stranger entering the garden.* This uses the past simple tense ("saw") for the interrupting event, which is grammatically correct and natural. B) he has seen a stranger entering the garden.* This uses the present perfect tense, which does not fit the timeline established by the past continuous. C) he was seeing a stranger entering the garden.* While grammatically possible, "see" is often a stative verb and "was seeing" is less common for a sudden perception than "saw". D) he could have seen a stranger entering the garden.* This implies possibility rather than a definite event. The correct option is $\boxed{\text{A}}$ 3 done, 2 left today. You're making progress.