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last a few last few a few last few last
since the last century for a very long time since a few hundred years ago since a few years ago
have had have been were has been
keep last remain continue
were have been has been was
has made had made was making is making
were have been has been was
have had have have been has been
Considering Regarding Supposing Providing
have produced have been produced are producing are being produced
a few；give few；gave few；has given a few；would give
A. were happened have been happened have happened happened
has changed have changed has change changed
is increasing has increased are increasing have increased
changes has changed changed was changing
a lot of lots of a lot a lots of
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