Task 1. Complete the second sentence so that it has a similar meaning to the first sentence.
Use between two and five words, including the word given in bold.
a) It’s possible that the stones for Stonehenge were moved by a system of levers. might
The stones for Stonehenge might have been moved by a system of levers.
b) It is almost certain that the material to build the Sphinx of Giza was transported down the Nile. must
The material to build the Sphinx of Giza must have been transported down the Nile.
c) The construction of the Great Pyramid of Giza probably involved up to 50,000 workers. could
The construction of the Great Pyramid of Giza could have involved up to 50,000 workers.
d) Perhaps the Nazca Lines in Peru were a map of underground water supplies. May
The Nazca Lines in Peru may have been a map of underground water supplies.
e) The Easter Island statues obviously didn’t come from outer space. can’t
The Easter Island statues can’t be from outer space.
f) Machu Picchu was almost definitely built as a fortress against powerful enemies. been
Machu Picchu has been built as a fortress against powerful enemies
Task 2.
Read about the invention of the microwave oven. Underline the most appropriate verb
structures to complete the description.
In 1946, Dr Percy LeBaron Spencer (1) worked / was working on a radar-based research project when he (2) felt / was feeling something sticky in his pocket. It turned out to be a melted peanut bar. Spencer guessed that it (3) had been affected / was affected by high frequency radio emissions from the magnetron a key component in radar. He (4) heard / had heard stories of partially cooked birds being found at the base of early radar installations but had, until now, dismissed them. Intrigued, he sent a boy out to buy a packet of popcorn. When
he placed it close to the magnetron, the popcorn exploded. By the end of that year, the first
prototype microwave oven (5) was installed / had been installed in a Boston restaurant.
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