Prefixes - challenge

I'm not trying to ___________ the car. I'm trying to invent something completely new. (INVENT)

The buses were always ___________ and you couldn't move at all. (CROWDED)

Our library is ___________. Some days no one goes in there at all. (USED)

Henry Ford was the first to mass produce the ___________. (MOBILE)

You could borrow a car at a special car park which has a ___________battery. You then take it back at the end of the day. (CHARGED)

If someone invented an ___________ car then people would drive even faster than they do now. (CRASHABLE)

I feel quite ___________ when I go to a party and don't know anyone. (SECURE)

This engine is ___________ and will work much better than any engine ever made before. (EFFICIENT)

If the pilot is here with us, the plane must be flying on _____

pilot.

• auto

• ultra

He's a great designer but I think this project may be a little ________ ambitious

• over

• ultra