Make sure to _______ the lights when you leave.

hool shop, customers are mainly students, is closed for the holidays.

The factoryused 65 percent of the raw materials, the rest of which _____ saved for other purposes.

6. As there is less and less coal and oil, scientists are exploring new ways of making use ofenergy, such as sunlight, wind and water for power and fuel.

What a beautiful necklace!—Yes.But the necklace I __________ 80 dollars is made of glass.