Времена и залог

Надо опр. время и залог.
1) Thousands of new products are being presented at the Consumer
Electronics Show in Las Vegas.
2) More companies are using 3-D printing to directly manufacture some
products.
3) The Committee on Banking Supervision has been working on a set of
recommendations.

Укажите предложение со сказуемым в страдательном залоге

Выберите один ответ:
a. Developed European countries are exporting high-quality goods all over the world
b. All decisions about goods production were made by the central offices in the Soviet block countries
c. Changes in consumer demand have influenced goods quantity and quality demanded

1. Most of the pictures in magazines depend on their content.
2. The art of printing was making fast progress during the 19th century.
3. Look! He is taking photoes with a new camera.
4. She had written only two letters by the day.
5. You will find this unique journal in a modest office building in Lower Manhattan.
6. Each of the students of our group has already bought the latest issue of Moscow News

There are many properties that man has found useful in his application of electromagnetic waves.
2. The flow of electrons in one direction results in an electric current.
3. The energy sources of the world are decreasing while the energy needs of the world are increasing.
b) 1. The isotopes of the element hydrogen were given individual names.
2. Electronics is usually thought of as that part of electricity which deals with vacuum tubes and translators.
3. The behaviour of metals is greatly affected by the changes in temperature.

. Make the following sentences passive.
1. A spinster has left a fortune.
2. He helped her in other ways.
3. They must do the work carefully.
4. He is signing the contract of employment now.
5. He will do me a favour, I'm sure.
6. They don't manufacture marine engines.
7. They won't tell the staff about the problems.
8. One can see the beauty of the buildings and the garden