A
The Chinese ……………………………….. the first toothbrush in 1498. (invent/discover)
invented
The Russians ……………………………………. the first satellite in 1957. (test/work)
tested
Doctors....... to find a cure for cancer nowadays. (try/reach)
are trying
NASA...... to photograph the Black Hole nowadays. (watch/try)
is trying
An American ……………………….………… the planet Pluto in 1930. (watch/discover)
discovered
A man from Norway ………………………….. a special tool to slice cheese in 1925. (buy/design)
designed
NASA........ a research about space at these days. (work/conduct)
is conducting
Experts........ the experiment results. (explore/evaluate)
are evaluating
What did Graham Bell invent? (television / telephone)
He invented the telephone.
What did Thomas Edison invent? (the light bulb / the spotlight)
He invented the light bulb.
Especially, teenagers..... high-tech devices. (cure/use)
are using
Scientists.... devices to make our daily life easier. (try/create)
are creating
Who discovered penicilin? (Alexander Graham Bell / Alexander Fleming)
Alexander Fleming discovered penicilin.
Who invented the world's first successful airplane? (The Wright Brothers / Hezarfen Ahmet Çelebi)
The Wright Brothers invented the world's first successful airplane.
Scientists...... an experiment on RNA(conduct/view)
are conducting
İlayda Şamilgil...... for NASA for Mars project. (explore/ work)
is working
Before the invention of .............. , sailors found their ways by looking at the stars. (map / compass)
compass
Before the invention of paper, drawings were done on .............. (ground / stone)
stone
He...... into the sky through a telescope now. (take/look)
is looking
A group of children in Mardin, Turkey,...... on to build a robot. (evaluate/work)
are working