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Time Expressions for Changes and Innovations
Author :
Atenas Leticia García Gámez
1.
Petrochemical engineers have _____ developed plastics and fine chemicals.
A
B
C
2.
The nuclear industry hasn't developed non-toxic energy_______.
A
B
C
3.
Lithium-ion batteries have revolutionized the industry ____ thirty years.
A
B
C
4.
Nanotechnology has been improving the different scientific sectors ______ its creation.
A
B
C
5.
I haven't bought an electric car _____, but my friends say it's very cheap.
A
B
C
6.
We have been implementing clean energies around the world _____ 1970.
A
B
C
7.
I have _______ installed the new solar water heater in my house.
A
B
C
8.
Elon Musk has been planning to take people to Mars ____ many years.
A
B
C
9.
Google has ____ released its new app.
A
B
C
10.
Apple has launched a new product _______.
A
B
C