When we use the -ing form of a verb as an adjective, we
mean that the person/animal/thing does the action of the
verb (e.g. an exciting book means "a book which excites
people").
When we use the past participle (the-ed form) of a verb
as an adjective, we mean that the person/animal/thing is
the object of the action of the verb (e.g. an excited child
means "a child whom someone or something has excited).
Choose the right words each time:
Mr Gray was (astonished/astonishing) to hear that there were two
hotels in such a small place. When he heard this
(astonished/astonishing) news, he was a little happier. His work
is (tired/tiring), and when he is very (tired/tiring), he often gets
ill. He finds talks about medicine on television very (inter-
ested/interesting). His wife is also (interested/interesting) in such
things, but last time they watched television, there were some
(annoyed annoying) flashes of light during the talk, and the
television company received a lot of telephone calls from
(annoyed/annoying) people.