________one scientist has pointed out, children’s skulls are not fully developed.
They are considering______ they should do the experiment .
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, ______?