8. Put the verbs in the correct tense. Dangerous Telephones
Modern communications (1) (to influence) our lives in many ways. Since the 1980s the
mobile phone (2) (to prove) to be the most popular means of communication. It (3) (to
introduce) publicly in Chicago in 1983 and (4) (to be) a success from the start.

However, scientists (5) (to believe) that mobile phones shouldn't (6) (to use) for more
than twenty minutes at a time because they may (7) (to develop) short-term memory
loss.
Microbiologists (8) (to discover) that more than 2,000 thousand different types of bacteria (9) (to live) on our telephones. They (10) (to make) people
ill with flu, cold, sore throats, earaches and many others. Bacteria life (11) (to
be) so active because of our dirty hands. Public telephone boxes (12) (to be)
very dangerous for our health. The special Cleaning Service (13) (to organize)
to clean telephone boxes. Town and city telephones in Great Britain (14) (to
clean) daily, often at 4 am, but in the country districts phones (15) (to receive)
weekly attention. The Cleaning Service also (16) (to remove) graffiti, (17) (to
wash) floors and glass panels. They (18) (to use) antiseptic sprays on the
mouthpieces.​

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