Meaning: 'How' refers to the manner or way in which something is done, indicating the process meteorologists follow to use the information.

Wrong options:

• whether: 'Whether' introduces alternatives or conditions, which does not fit the context of explaining the method of usage.
• what: 'What' would imply a question about the specific information, rather than the method of using it, making it contextually inappropriate.
• that: 'That' is a conjunction used to introduce a clause but does not convey the manner of action, thus failing to fit grammatically.

Correct answer: posted

Explanation: The word 'posted' is the correct past participle form that indicates the photos were uploaded online. It fits grammatically as it describes the state of the photos in relation to the action of looking at them.

Meaning: 'Posted' means that the photos have been uploaded or shared on the internet, indicating their availability for viewing.

Wrong options:

• posting: 'Posting' is the present participle form, which does not fit the past tense context of the sentence.
• posts: 'Posts' is a noun that refers to the photos themselves but does not fit grammatically as a verb in this context.
• post: 'Post' is the base form of the verb, which does not align with the past tense required in this sentence.

Correct answer: no

Explanation: The word 'no' fits grammatically as it negates the availability of information from satellite photography, aligning with the context that indicates a lack of data due to heavy cloud cover.

Meaning: 'No' means not any or none, indicating that there is a complete absence of information from satellite photography.

Wrong options:

• some: 'Some' implies a quantity exists, which contradicts the context of lacking information.
• much: 'Much' suggests a large amount, which is also inconsistent with the idea of no information being available.
• any: 'Any' would imply the possibility of some information existing, which does not match the definitive absence indicated by 'no'.

Correct answer: concerned

Explanation: The word 'concerned' is the correct past participle that describes the state of urban weather in relation to the necessity of using the information source. It fits grammatically as it describes how urban weather is viewed in this context.

Meaning: 'Concerned' means being affected or involved with something, indicating that urban weather is not significantly impacted by the lack of this information source.

Wrong options:

• concerning: 'Concerning' is a preposition that does not fit grammatically as it would require a different sentence structure.
• regarding: 'Regarding' is also a preposition and does not fit the grammatical structure needed here.
• regarded: 'Regarded' is a past participle but does not convey the intended meaning of being affected by the information source.

Correct answer: about

Explanation: The word 'about' fits grammatically as it indicates the subject matter of the knowledge gaps. It aligns contextually with the discussion of filling in knowledge regarding weather events.

Meaning: 'About' means concerning or relating to, indicating the specific topic of the knowledge gaps being discussed.

Wrong options:

• with: 'With' implies accompaniment or association, which does not fit the context of discussing knowledge gaps.
• for: 'For' suggests purpose or benefit, which does not align with the context of describing the subject matter of knowledge gaps.
• on: 'On' typically indicates a surface or topic but does not convey the same relational meaning as 'about' in this context.