The engineers ______ (not/find) the source of the fault yesterday.
didn't find
Petroleum is a type of:
a) fossil fuel
b) renewable source
c) tidal power
a) fossil fuel
Appliances are:
a) small electrical devices used at home
b) power stations
c) types of cables
a) small electrical devices used at home
Look at those dark clouds. It ______ rain.
a) will
b) is going to
c) goes to
b) is going to
Correct the mistake:
He has install the new system.
installed
Correct the mistake:
He didn’t installed the device.
install
Biomass energy comes from:
a) organic material
b) uranium
c) sea waves
a) organic material
A neutron has:
a) a positive charge
b) no electric charge
c) a negative charge
b) no electric charge
I think renewable energy ______ become more important in the future.
a) is going to
b) will
c) is
She hasn’t checked the results ______.
a) already
b) yet
c) just
b) yet
Rewrite in negative:
The company invested in solar energy last year.
The company didn't invest...

Copper
Current is measured in ______.
amperes
The phone is ringing. I ______ answer it.
a) am going to
b) will
c) going to
b) will
Complete: She ______ (not/check) the voltage yet.
hasn't checked
Make a sentence: The system / not pass / the safety test
The system didn't pass the safety test.
Name the material and decide if it is a conductor or an insulator: 
It's rubber - insulator
Name this material:
Fiberglass
Transform into a planned intention:
I will replace the cables tomorrow.
I'm going to replace the cables tomorrow.
Correct the sentence: We have finished the installation yesterday.
We finished the installation yesterday / We have finished the installation today
Make it a question: The team completed the installation on time.
Give two examples of insulators.
Many answers (Ceramic, rubber, glass, wood, fiberglass, plastic)
Give two examples of conductors.
Many answers (Copper, zinc, aluminum, silver, gold, iron)
Explain the difference in meaning:
I will repair it.
I am going to repair it.
will = offering help, spontaneous decision
going to = plan
Make a sentence: They / not upgrade / the system / yet
They haven't upgraded the system yet.