4 **Write the sentences using personal and impersonal constructions.
1
The police reported that the stolen watch
was worth millions of pounds.
a The stolen watch
b It was reported
2 They estimate that the new timekeeping
device will improve time tracking.
a The new timekeeping device
b It ...
3 Scientists believed that obelisks were
invented after the sundial.
a Obelisks ...
b It​

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