Misc: Poisonous substance especially a pesticide?

Questions

On This Day In January 1893 - The first commemorative ______ stamps were issued.?

On This Day In January 1900 - U.S. Secretary of State John Hay announced the Open ______ Policy to prompt trade with China.?

On This Day In January 1900 - The Chicago ______ opened.?

On This Day In January 1910 - The first junior high school in the United States opened. ______ School in Berkeley, CA, housed seventh and eighth grade students. In a separate building students were housed who attended grades 9-12.?

On This Day In January 1917 - Royal Bank of ______ took over the Quebec Bank.?