Раскройте скобки, поставив глаголы в Present Perfect Passive Voice:
The box {to cover) with heat-insulating material.
Light {to transform) into heat.
Several sheets of iron {to buy).
Not enough water {to boil).
These trees {to find) at 2,000 feet above sea level.
The box {to cover) with heat-insulating material.
Light {to transform) into heat.
Several sheets of iron {to buy).
Not enough water {to boil).
These trees {to find) at 2,000 feet above sea level.
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Ответ:
The box has been covered with heat-insulating material.
Light has been transformed into heat.
Several sheets of iron have been bought.
Not enough water has been boiled.
These trees have been found at 2,000 feet above sea level.
Объяснение: