IV.Supply the correct passive form of the verbs in brackets.
1.This computer _____(use)fortwoyears.
2. America____(discover) by Christopher Columbus.
3.I think this in stitution _____ (widen) twice since 1999.
4. Sydney Opera House in Australia ____(finish) in 1973.
5.My sister is studying law at Viet Nam National University, Ho Chi Minh city now . This university ___(situate) in Thu Due District.
6. The Great Wall in China___(build) many centuries ago.
7. David and his father____(visit) the Temple of Literature last week.
8.The Golden Gate Bridgein San Francisco ____(complete) in 1937.
9.The University of Cambridge ____(form) in 1209. It is always considered to be one of the most prestigious universities in the world.
10. BurjKhalifa in Dubai , the highest building in the world , ____(open) in 2010