騷客。眼迷離。

Which is right?

□ 1. I received a number of telephone inquiries after placing an ad on the newspaper.

□ 2. I received a number of telephone inquiries after placing an ad in the newspaper.

     1. I received a number of telephone inquiries after placing an ad on the    newspaper.

○ 2. I received a number of telephone inquiries after placing an ad in the newspaper..

指平面媒體如報紙、雜誌、書籍時應用介系詞in，而指電話、廣播等時則應用on。

It is correct to say "on the telephone", "on the radio" and "on the air". However, you should use "in" for print media such as newspapers, magazines and books.