Ответ:
Ex.5.
a)
1) speaker / speech , buyer, destroyer / destruction, creator / creation ,
dumper / dumpiness, picnicker
2) operator / operation, illustrator / illustration, radiator / radiation, cooperator / cooperation
3) calmness, illness, softness/ softener, readiness, darkness
b) He is a good public speaker.
He opens the meeting with a brief speech.
We can find a buyer for your house.
Alcohol is a destroyer of families
.
They saved the building from destruction.
The room is in total darkness
.
Объяснение: