11.6. Write the sentences using personal and impersonal constructions.
Experts believe that they will have renovated the clock tower by the end of the year.
The clock tower
It is believed
They say that the Salisbury Cathedral clock in England is the oldest working clock.
The Salisbury Cathedral clock in England
3 They estimate that the oldest timekeeping device is a sundial from Egypt that dates back to 1500 BC.
A sundial from Egypt that dates back to 1500 BC
It
4
Some people think that time travel is possible.
Time travel
It
5 They say that the 3D Quantum Gas Atomic Clock is the most precise clock in the world.
The 3D Quantum Gas Atomic Clock