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Ответ:

1

To speak - speech;  a speaker;  a loudspeaker.

To buy - а buyer; buying.

To destroy - а destroyer.

To create - а creator; creating; creation.

To dump - а dumper; dumping.

To picnic - а picnic.

№2.

To operate - an operator; operation.

To illustrate - an illustrator; illustration.

To radiate - a radiator; radiation.

To cooperate - a cooperator; cooperation.

№3.

Calm - calmness

ill - illness

soft - softness

ready - readiness

dark - darkness