How often __________ hotel carpets __________?
are / cleaned
is / cleaned
was/ cleaned
will be / cleaned
The most famous portrait in the world, Mona Lisa, ________________ by Leonardo da Vinci.
was painted
is painted
were painted
has been painted
X-rays __________________ in 1895 by Wilhelm Conrad Roentgen, who was a German Professor.
are discovered
discovered
is discovered
were discovered
The movie Avatar _______________ by James Cameron.
is directed
was directed
is being directed
directed
Google ____________ officially ____________ in 1998.
were launched
has been launched
is launched
was launched
The light bulb ____________________ by Thomas Edison.
were not invented
was not invented
has not been invented
were invented
Wooden toothpickes ______________ from birch wood.
have been cut
were cut
will be cut
are cut
The Harry Potter series __________________ by J. K. Rowling.
written
was written
wrote
is written
Scissors ___________________ for cutting thin materials, such as paper and metal foil.
are used
use
is used
used
Brilliant ideas ________ generally __________.
is / copied
were / copied
are / copied
have been / copied
Olives _______________ in Mediterranean countries.
has been grown
is grown
was grown
are grown
The tunnel _________________________ at the moment, so it's closed for all traffic.
repaired
is repaired
is being repaired
will be repaired
The last Olympic Games _____________ in Tokyo.
will be held
were held
are held
have been held
Cars _______________ in factories.
are produced
were produced
produced
is being produced
When ___________ the Great Wall of China ____________?
is / build
were / built
built / were
was / built