4 Complete the text with the correct form of the passive.
The first books (1 print)
in the
15th century and billions of books (2 sell)
since then. Millions of books
(3 read)
at this very moment.
However, some people don't think books
(4 read)
very much in the future.
They think people will use CDs on their
computers instead. But some experts think
that the use of books won't change. When
photography (5 invent)
in the
19th century, many people said that
painting would die out. But painting hasn't
died out, and since then drawings and
pictures (6 use)
for different
things.
1 was printed
2 have been sold
3 are being read
4 will be read
5 was invented
6 have been used