Li Ping was born_________ .
John Snow found that the polluted water was _________ for the outbreak of cholera.
--Good afternoon. Can I help you?--My bike is broken. I’d like to have it______, sir.
________by the beauty of nature, the girl from London decided to spend another two days on the farm.
With a lot of difficult problems _________, the manager felt worried all the time.
_____ was obvious ______ the manager was waiting for LiFang to leave.