Select the most appropriate word to fill in the blank.

Please complete the short questionnaire ______ and return it to us.

attached

The most appropriate word to fill in the blank is attached.

The word attached means to be joined or fastened to something else. In this case, the sentence is saying that you should complete the short questionnaire attached to this email and return it to us. This means that the questionnaire is physically attached to the email, or that it is linked to the email in some way.

The other options do not make sense in the context of the sentence.

• Separated means to be divided or split apart. It cannot be used in this sentence because it does not convey the same meaning of "joined or fastened to something else".
• Excluded means to be left out or not included. It cannot be used in this sentence because it does not convey the same meaning of "joined or fastened to something else".
• Concluded means to come to the end of something or to reach a decision. It cannot be used in this sentence because it does not convey the same meaning of "joined or fastened to something else".