She didn't see me come and went on ______ her newspaper.

单项选择题The air of countryside is cleaner than ______ of city, but I don't like to live ______ far.

单项选择题Madame Curie's ______ encouraged many women to study science, and many of them ______.

单项选择题Who is it up ______ decide ______ whether to go or not

单项选择题Some old pots ______ clay were found lying ______ to the dead body.

单项选择题The largest city in Canada is ______.