Pagina 395

Esercizio 1

1. Beer isn’t drunk by Micheal.
2. Our summer holidays have just been booked by us.
3. Some texts were sent two days ago by Rachel.
4. The mirror was broken by him.
5. Vegetables are grown by farmers.
6. He will be phoned by me.
7. A ghost has just been seen by somebody.
8. More than 30 plays were written by Shakespeare

Esercizio 2

For the first step, natural ingredients such as flowers, fruit and wood are harvested from around the world. Alcohol, petrochemicals and other chemical substances are also used in the manufacture of perfumes. Not every plant contains essential oil; oils aren’t produced naturally by, for example, lily of the valley flowers.

In the next step, the oil is extracted. This is done immediately after picking. Solvent extractions is a common method. To extract oil from roses, layers of petals are placed on a metal-layered drum. The flowers are then immersed in a solvents. The result of this process is a waxy material that contains the oil, which is then washed in ethyl alcohol. The oil is dissolved in the alcohol and rises. Other extraction methods include steam distillation, enfleurage and maceration. A huge number of plants are needed to get a small amount of essential oil. Approximately 200,000 rose flowers, that is 400 kilograms of flowers are required to make 600 grams of essential oil.

Once essential oil is ready, it is blended together according to a certain formula and then it is mixed with alcohol. It may takes as many as 800 different ingredients and several years to develop the special formula for a scent. In the last step of the process, the perfume is aged for several months or even years after it is blended

Esercizio 4

1. We got there late and birthday cake had been already served.
2. Is there anybody here who knows when the Tower of London was built.
3. Some of these painting have been lent by a private collector.
4. If it stops snowing tomorrow, the roads will be cleared.
5. The ticket that won the first prize in the lottery was bought last week near Rome.
6. Yesterday the alarm of a car that had been parked near ours rang for more than two hours!

Esercizio 5

1. The car isn’t washed by David every Saturday/ Is the car washed by David every Saturday?
2. The film hasn’t been seen by lots of teenagers/ Has the film been seen bay lots of teenagers?
3. The children weren’t helped by an elderly lady/ were the children helped by a elderly lady?
4. That bridge hadn’t been built just the year before/ Had that bridge been built just the year before?
5. A ghost hasn’t been seen here/ Hass a ghost been seen year?
6. The meeting won’t be put off/ Will the meeting be put off?