In the past, people sent letters to others through the mail/postal service.
Question 1:
In the past, people sent letters to others through the mail/postal service. However, since the advent of the*^*Internet, people can now send e-....... to others very quickly. The messages are sent by the click of a button*^*and arrive to the recipient's inbox almost instantly.
A.couriers
B.mails
C.letters
D._
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