Find and correct the mistakes marked A,B,C,D in the followin

Find and correct the mistakes marked A,B,C,D in the following sentences.
(1)\x05 Edison had to invent fuses,which was an important safety device
A B C
beloved by insurance companies.
D
(2)\x05According to its size computer systems are usually divided into
A B C D
four main types.
(3)\x05To the end of 1880s,the electric industry had become a rather big
A B C D
one in the U.S.A.
(4)\x05Modern communication process is involved many technologies.
A B C D
(5)\x05They are engaged in designing a new type of computer rather than
A B C
repair the machine.
D