The mechanic (is repairing / was repairing) the engine now.
He (measured, will measure) electrical power 2 hours ago.
A new power station (is built/will be built) in the nearest future
Now all substances (is, are) good conductors of electricity.
Battery cells (have, has) dry cells and wet cells.

sssaaa4    2   16.03.2020 07:40    248