You’d better fly somewhere in the west. Then you can _________ a hire car and travel around.
The doctor suggested he ______.
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?