Meaning: 'Sensors' are devices that detect changes in the environment, such as sound, light, or motion, allowing the robot to respond to music.

Wrong options:

• signals: Signals refer to messages or indicators, but do not specifically denote a device that detects music, making it contextually inappropriate here.
• switches: Switches are mechanisms for opening or closing a circuit, which does not relate to detecting music, thus failing to fit the context.
• servers: Servers are systems that provide data to other computers, which is unrelated to the robot's function of detecting music.

Correct answer: outside

Explanation: The word 'outside' is an adverb that indicates the location from which the music is coming, fitting grammatically and contextually as it describes the source of the music the robot detects.

Meaning: 'Outside' means external to a particular area, indicating that the music source is not within the robot itself but rather in the environment around it.

Wrong options:

• away: 'Away' implies a distance but does not specify a location for the music source, making it less precise in this context.
• abroad: 'Abroad' refers to foreign countries, which is irrelevant to the context of music detection by the robot.
• through: 'Through' suggests movement from one side to another, which does not accurately describe the source of music in this context.

Correct answer: depending

Explanation: The word 'depending' is a gerund that indicates a conditional relationship, fitting grammatically and contextually as it describes how the patterns of the LEDs change based on the musical style.

Meaning: 'Depending' means being contingent upon or influenced by something, in this case, the musical style affecting the LED patterns.

Wrong options:

• moving: 'Moving' suggests action but does not convey the conditional relationship needed in this context, making it grammatically incorrect here.
• seeming: 'Seeming' implies appearance rather than a conditional relationship, which does not fit the context of how the LEDs react to music.
• listening: 'Listening' refers to the act of hearing, which does not apply to the LEDs' behavior, thus failing to fit the context.

Correct answer: by

Explanation: The word 'by' is a preposition that indicates the means or method of the robot's dancing, fitting grammatically and contextually as it describes how the robot performs its movements.

Meaning: 'By' indicates the method or means of doing something, in this case, how the robot dances through its movements.

Wrong options:

• in: 'In' suggests a location or state, which does not accurately describe the method of dancing, making it grammatically incorrect here.
• of: 'Of' indicates possession or relation, which does not fit the context of describing how the robot dances.
• out: 'Out' implies movement away from a place, which does not accurately convey the method of dancing in this context.

Correct answer: respond

Explanation: The word 'respond' is a verb that indicates the robot's ability to react to programming, fitting grammatically and contextually as it describes the robot's function when connected to a computer.

Meaning: 'Respond' means to react or reply to something, indicating that the robot can execute programmed movements based on input.

Wrong options:

• return: 'Return' implies going back to a previous state, which does not accurately describe the robot's ability to execute movements, making it contextually inappropriate.
• resume: 'Resume' suggests continuing after a pause, which does not fit the context of programming new movements for the robot.
• remove: 'Remove' means to take something away, which does not relate to the robot's ability to perform movements, thus failing to fit the context.