Have you ever written letters to someone? Have you ever been to the post office to send letters? For many people, the answer is no. In the past, letters   30      to get in touch with your family or lovers. They would be so excited if they   31       a letter every day. However, people now use e-mail   32    . Take the lovers, Mary and John, for example. They have known each other for three years, and because they don’t live in the same city, they can’t see each other very often. They send e-mail to each other every month because they think it is faster and more convenient. They don’t write letters because it takes a few days for letters to arrive. Now can you see   33         more often?
【題組】30.
(A) use
(B) are used
(C) were used
(D) have been used