单项选择题
A.has been B.was C.are D.would be
On formal（）, people pay more attention to manners.A.sit...
单项选择题On formal（）, people pay more attention to manners.
A.situations B.cases C.conditions D.occasions
On average, a successful lawyer has to talk to several（...
单项选择题On average, a successful lawyer has to talk to several（）a day.
A.customers B.supporters C.guests D.clients
On（）side of the street there are some trees.A.both B....
单项选择题On（）side of the street there are some trees.
A.both B.either C.every D.all
