Passage Reference: Its main components are the housing (the outer part of the lock which does not move

Common Mistake: Students sometimes write outer part because that is how it is described, but the diagram answer must use the exact word from the passage. Writing a description instead of the passage word is a synonym trap.

Paraphrasing: Passage: 'the housing (the outer part of the lock which does not move)' = Diagram: 'outer fixed part of the lock'

Tips: For diagram questions, look for definitions in brackets - they often match the diagram labels.

Key Vocabulary:

• housing = outer cover
• mechanism = moving system

Question Focus: Identifying the vertical metal parts inside the shafts

Correct Answer: pins

Passage Reference: Inside these shafts are pairs of metal pins of varying length, held in position by small springs.

Why this is correct: The diagram arrow points to the small vertical metal pieces inside the lock. The passage names these clearly as pins, so that is the correct label.

Common Mistake: Some students write shafts because the pins sit inside them, but the arrow points to the metal pieces themselves, not the holes. This is a context shift trap.

Paraphrasing: Passage: 'pairs of metal pins' = Diagram: 'small vertical metal parts'

Tips: Check carefully what the arrow touches - the object itself, not the space around it.

Key Vocabulary:

• shaft = narrow hole
• pin = small metal rod

Question Focus: Labeling the parts that hold the pins in position

Correct Answer: springs

Passage Reference: Inside these shafts are pairs of metal pins of varying length, held in position by small springs.

Why this is correct: The diagram shows small coiled parts above the pins. The passage says the pins are held in position by small springs, so the correct label is springs.

Common Mistake: Students sometimes write coils based on the picture, but that word does not appear in the passage. This is a synonym trap.

Paraphrasing: Passage: 'small springs' = Diagram: 'coiled parts above the pins'

Tips: Even if the picture suggests another word, always copy the exact word from the passage.

Key Vocabulary:

• spring = elastic metal coil
• position = place

Question Focus: Identifying the object inserted into the lock

Correct Answer: key

Passage Reference: When you put the correct key into the cylinde

Why this is correct: The diagram shows the object being inserted into the lock from outside. The passage clearly calls this the key, so that is the correct answer.

Common Mistake: Some students write correct key, but the diagram label only needs the object name. Adding extra words is unnecessary and risks a word limit trap.

Paraphrasing: Passage: 'put the correct key into the cylinder' = Diagram: 'object inserted into the lock'

Tips: Use the shortest correct form when labeling diagrams unless the passage requires more words.

Key Vocabulary:

• key = metal opener
• insert = put in

Question Focus: Labeling the central rotating part of the lock

Correct Answer: cylinder

Passage Reference: Its main components are the housing (the outer part of the lock which does not move), the central cylinde

Why this is correct: The arrow points to the central round part that turns when the key is used. The passage names this part the cylinder, so that is the correct label.

Common Mistake: Students sometimes write mechanism, but the mechanism is a different part connected to the cylinder. This is a partial truth trap.

Paraphrasing: Passage: 'the central cylinder' = Diagram: 'middle turning part of the lock'

Tips: If the passage lists components, those exact nouns are very often used as diagram answers.

Key Vocabulary:

• cylinder = round central part
• rotate = turn

General Tips:

• Diagram completion answers always come directly from the passage - never invent your own words.
• Follow passage order - later labels usually appear later in the text.
• Check the word limit carefully. Short labels are safest.
• Look at what the arrow touches, not just what is nearby.