by + gerund or noun

The passengers activate the ticket machine ______________ the screen.

• touch

• by touching

• touching

• by touch

You switch on the phone ___________ the green button.

• by press

• pressing

• by pressing

• press

The user starts the outboard motor _________ the handle of the cord.

• by pulling

• pulling

• by pull

• pull

The driver starts the motorbike engine _____________ the lever downwards.

• kick

• by kick

• kicking

• by kicking

The burglar activates the alarm ___________ the beam.

• by breaking

• by break

• breaking

• break

The latest cars can be operated _________________.

• by remote controlling

• by remote control

• controlling

• remote control

You need to inflate the tyres __________________.

• by pump

• pump

• by pumping

• pumping

You can activate the lever ________________ the pedal.

• by pump

• pump

• pumping

• by pumping

The robot navigates itself ______________________.

• sensoring

• by sensor

• by sensoring

• sensor

The robot can 'see' obstacles ____________________.

• by camera

• camera

• sensor

• devices