Many lakes and rivers ________ by industrial waste. A: A have polluted B: B have been polluted C: C had been polluted D: D has been polluted

‍If we had taken such effective measures much earlier, the river _____ so seriously now.‎ A: is not polluted B: would not be polluted C: had not been polluted D: would not have been polluted

Generally, air will be polluted _______ there are factories.

Rives _ used to be polluted by industrial chemical waste.

Breathing such polluted air is the _______ of smoking ten cigarettes a day.

The(poison) ___ gases from the cars have polluted the air.

The polluted air in the city is badly__________________ the health of the residents. (perilous)

The photographs show that the Earth's atmosphere is seriously polluted

The waste gas of cars has only badly polluted the air.

Polluted air is deleterious ______ human health. A: of B: to C: on D: for