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1.Alexander Bell was …………………..a) an engineer;b) teacher;c) doctor.


2. He worked at inventing …………………..a) radio-set;b) tape-recorder;c) telephone.

3. He worked at it …………………..a) alone;b) with his friend;c)with a group of scientists.

.4. The first transcontinental telephone line was opened between ……………..a) New York and San Francisco;b) Paris and London;c) Rome and Berlin

.5. During the experiment Mr. Watson heard …………………..a) Bell very badly;b) Bell very well;c)nothing.