Inventions and discoveries

The first electronic computer was created by...

The theory of relavity was developed by..

When were shadow clocks first used?

Alexander Bell was invented ...

It is a large container that uses electricity to keep food cold

Study .... (clean) yesterday

The letters .... (receive) last week

The houses ... (buy) five years ago

The science books ... (read) by hundreds of people every day

Many experiments .... under water

The Cape of Good Hope .... by Bartolomeo Dias

Many exciting things .... by them last week