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g. While Dr Harry Coover tried / was trying to invent a new kind of pIastic, he made
/ was making a very soft substance which stuck / was sticking things together. It was
Superglue.
h. While he observed / was observing the Moon through his teIescope, Galileo
realized / was realizing that it had mountains and craters.
2. Use the prompts to make a question. The answers are in Exercise 1.
a. Where / Edouard Benedictus / work when he invented safety glass?
Where was Edouard Benedictus working when he invented safety glass?
b. Where / Columbus / try to go when he reached America? _______________ ?
c. Where / Isaac Newton / sit according to the story about gravity?__________ ?
d. What / Dr Harry Coover I'hope to invent? ___________________________ ?
e. What Galileo / look at / through his telescope? _______________________ ?
3. Complete the sentence with the past continuous form of the verb in brackets.
The sentences refer to Exercise 2.
a. Edouard Benedictus (not try) ____________________ to invent safety glass .
b. Alexander Fleming (not hope) ___________________ to discover penicillin.
c. Hiram Bingham (not Iook for) ______________ the lost city of Macchu Picchu.
d. Isaac Newton (not sit) _____________ in his study when he understood gravity.
e. Dr Harry Coover (not conduct) __________________ an experiment to discover a
kind of glue.
4. Complete the sentence with the past simple or past continuous form of the
verb in brackets.
ALEXANDER THE GREAT
a. While he (grow up) was growing up
, the philosopher Aristotle was his teacher.
Alexander (become) became
interested in science, medicine, philosophy and
literature.
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