As soon as I got on the bus I realized that I________ my papers in the house.
Lincoln, ______ President of ______ United States, was assasinated(暗杀)on April 14th , 1865 .
Why ______ a bad idea to ask Amy for advice?
Which is ______ country, Canada or Australia?
I don't think the bottle's broken, ______?
The song he sang at the party ______the most popular of all .