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