8. Put the verbs in the correct tense. Dangerous TelephonesModern communications (1) (to influence) our lives in many ways. Since the 1980s themobile phone (2) (to prove) to be the most popular means of communication. It (3) (tointroduce) 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 morethan twenty minutes at a time because they may (7) (to develop) short-term memoryloss.Microbiologists (8) (to discover) that more than 2, 000 thousand different types of bacteria (9) (to live) on our telephones. They (10) (to make) peopleill with flu, cold, sore throats, earaches and many others. Bacteria life (11) (tobe) 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) (toclean) 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) (towash) floors and glass panels. They (18) (to use) antiseptic sprays on themouthpieces.​