RO Learner
a fost răspuns

1 Underline the correct form.
a While he took / was taking a bath, Archimedes discovered / was discovering the principles of
density and buoyancy.
b When Edouard Benedictus, a French scientist, worked / was working in his laboratory, he
dropped / was dropping a glass bottle which had some plastic inside - and invented / was
inventing safety glass.
c Columbus arrived / was arriving in America while he tried / was trying to reach the Far East.
d Alexander Fleming discovered / was discovering penicillin by accident while he looked / was
looking at some old experiments.
e While Hiram Bingham climbed / was climbing in the mountains of Peru in 1911, he discovered
I was discovering the lost city of Macchu Picchu.
f While Isaac Newton sat/ was sitting under an apple tree, an apple fell / was falling on his
head, and he understood / was understanding gravity.
g While Dr Harry Coover tried
I was trying to invent a new
kind of plastic, he made
I 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 telescope, Galileo realized
I was realizing that it had
mountains and craters.

Răspuns :

Răspuns:

a While he **was taking** a bath, Archimedes **discovered** the principles of density and buoyancy.

b When Edouard Benedictus, a French scientist, **was working** in his laboratory, he **dropped** a glass bottle which had some plastic inside - and **invented** safety glass.

c Columbus **arrived** in America while he **was trying** to reach the Far East.

d Alexander Fleming **discovered** penicillin by accident while he **was looking** at some old experiments.

e While Hiram Bingham **was climbing** in the mountains of Peru in 1911, he **discovered** the lost city of Macchu Picchu.

f While Isaac Newton **was sitting** under an apple tree, an apple **fell** on his head, and he **understood** gravity.

g While Dr Harry Coover **was trying** to invent a new kind of plastic, he **made** a very soft substance which **stuck** things together. It was Superglue.

h While he **was observing** the Moon through his telescope, Galileo **realized** that it had mountains and craters.

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