In the olden days, shopkeepers used to dupe the ________ customers by attacking removable magnetic weights ________ their weighing instruments.

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**Solution:**

1. The sentence talks about shopkeepers duping customers by using removable magnetic weights.

2. The adjective describing customers should imply they are unsuspecting or easily fooled. Among the options, "innocent" fits best.

3. The preposition describing the position of the magnetic weights relative to the weighing instruments should indicate something hidden or beneath. "Under" is the correct preposition here.

4. Other options either do not fit contextually or grammatically:
   - "cheating" is a verb, not an adjective.
   - "strict" does not describe customers well in this context.
   - "docile" means submissive but is less common here.
   - "lovely" is irrelevant.
   - Prepositions like "for", "with", "across", and "from" do not correctly describe the placement of weights.

**Answer:** Option 4: "innocent, under"

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