1)The room is being
cleaned and aired now.
2)Two new
engineers have just been introduced to the head of the
department.
3)The engineer's
calculations can be relied on.
4)The
light has not been turned off yet.
5) The
devices have been installed and checked by the beginning of yesterday's test.
6)The
battery is being recharged now.
7)This
mountain has never been climbed before.
8)Next
week the students will be asked to carry
out the experiment.
9)Electric
power is transferred at high voltage.
10 )This
power plant is constructed in 1935.