Please ______ the form in black ink and return it by post.

Answer and explanation

Correct answer: C. fill in

  1. Step 1: 'Fill in' a form means to complete it.
Answer
fill in.
Why not the others: "fill on" is wrong because 'fill on' is not an expression. "fill with" is wrong because 'fill with' needs a container or substance. "fill off" is wrong because 'fill off' is not an expression.

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Please the form in… | Cyprus English Language Certification (B2, C1, C2)