2. "Yes" and dash cannot be used at the same time. Delete the dotted line.

This is a multiple-choice question, and the first question is comma.

You copied the question wrong. There is a number at the end of the original sentence. Recently, many new buildings were exhibited at Xichang Housing Fair: Haihe Dijing, Hehai Garden and Sunshine Garden. Ellipsis is used to omit enumeration, and a period is used at the end of the sentence, so you can't use a period after the ellipsis. The period at the end of this sentence should be deleted.

5. This sentence is still optional, and the question mark in front is changed into a comma.

6. Seventeen and eighteen are approximate figures, and pause means juxtaposition and should be deleted.