2. The invention of the cellular system during that year (regulate ) the
portable telephone.
a. regulate
b. regulates
c. regulated
3.A portable telephone (use ) radio waves to transmit and receive aud
signals.
a. use
b. uses
c.used
4. Today, personal communication no longer ( depend) on wires.
a. depend
b. depends
c. depended
Answers & Comments
Answer:
B.
B.
A.
Explanation:
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