Question

do error and correct
a Cellphones have became a vital link
b with the world. They provide immediately
c connectivity and are especially useful in an
d event of an emergency. Though the excessive
e use of cellphones is even posing serious risks.
f They are believe to cause cancer.
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Answer 1

cellphones have become a vital link with the world . they provide immediate connectivity and are especially useful in an event for any emergency. though excessive use of cellphones is even caused serious risks.they are believed to cause cancer .

Answer 2

  Error                         Correctiona

a. became                     become

b. immediately              immediate

c. are especially             especially are

d. Though                              -

e. even                                   -

f. believe                          believed