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1.The workers
applied a new method of construction. 2. The engineers discuss the
existing conditions at the plant.  3. The mechanism will work much longer.
4. The scientists started the experiment 5. The oil field produced oil
of good quality.6.The real exploitation of crude oil began in the 19th
century. 7. The economy of many nations is influenced by petroleum
industry.

1.
Did the workers apply a new method of construction?

What
method of construction did the workers apply?


2.
Do the engineers discuss the existing conditions at the plant?

Where
do the engineers discuss the existing conditions?


3.
Will the mechanism work much longer?

How
long will the mechanism work?


4.
Did the scientists start the experiment?

Who
started the experiment?


5.
Did the oil field produce oil of good quality?

What
did the oil field produce?


6.
Did the real exploitation of crude oil begin in the 19th century?

When
did the real exploitation of crude oil begin?


7.
Is the economy of many nations influenced by petroleum industry?

What
is the economy of many nations is influenced by ?