Put the verbs given in brackets in the necessary form.
A CORDLESS TELEPHONE WITH BASE

As it (to know), George Sweigert, an amateur radio operator and inventor from Cleveland, Ohio, (to recognize) as the father of the cordless phone. He (to submit) his “full duplex wireless communication apparatus” and (to award) by the U.S. Patent and Trademark Office a patent for his invention in 1969. A cordless telephone or portable telephone (to be) a telephone with a wireless handset that (to communicate) via radio waves with a base station connected to a fixed telephone line, usually within a limit ed range of its base station, which (to have) the handset cradle. The base station (to be) on the subscriber premises, and (to attach) to the telephone network the same way a corded telephone (to do). But unlike a corded telephone, a cordless telephone (to need) mains electricity to power the base station. The cordless handset (to power) by a rechargeable battery, which (to charge) when the handset (to sit) in its cradle. In the 1980s a number of manufacturers (to introduce) cordless phones for the consumer market. Typically they (to use) a base station that (to connect) to a telephone line and a handset with a microphone, speaker, keypad, and telescoping antenna. The handset (to contain) a rechargeable

battery, usually NiCd. The base unit (to power) by household current, typically via a wall wart. The base (to include) a charging cradle, which (to be) generally a form of trickle charger, on which the handset (to rest) when not in use.

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