Before cars were invented, it ............................................(not/be) easy to take your family for a weekend outing.
couldn't have been/ can't have been
In the 1940s, people ............................................(not/own) a television, because they could get news and entertainment from their radios.
didn't need to own
Before satellite navigation in cars, people ........................(depend) on a passenger for directions.
had to depend
Some people ........................................................(drive) with the steering wheel in one hand and a map in the other.
had to drive
I .................................................(buy) this microwave oven, I never use it.
shouldn't have bought
Before we all had digital cameras, it ................................(be) expensive to keep buying film for your camera.
must have been
The electric spaghetti fork is a useless invention. The inventor really ..............................................(bother)
shouldn't have bothered.
The inventor of 'cats eyes' in the road ............................................(be given) a medal. They have saved so many lives.
should have been given
When James Watt invented the steam engine, he ................................................(realised) that the railway locomotive would follow.
must have realised
Who knows what inventions people like Leonardo da Vinci .....................................(come) up with if they'd had modern technology.
could have come
