.Is this the very factory____he visited last month?
I failed in the job interview and only then _____ the importance of learning English well.
Not knowing what to do next, the girl _____ her parents for advice.
Mr Green asked Lily ______ she had written to her father _____.
---- Do you know our town at all? ---- No, this ______ the first time I ______ here.
It was _____ terrible earthquake and _____ number of people who were killed reached more than 20,000.