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Пожалуйста помогите!!!Заполните пробелы с соответствующими...

Пожалуйста помогите!!!Заполните пробелы с соответствующими формами из правой колонке
1. The houses ... many years ago are not as convenient as the modern ones.
2. What is the number of apartment houses ... in the past few years?
3. The number of apartment houses ... for the population of Moscow is rapidly growing.
4. The workers ... this house used new construction methods.
5. At the conference they discussed new methods ... in building.
6. The new methods ... in the building of houses proved more effective.
7. Here are some samples of the products of this plant ... to different parts of the country.
8. These are the samples of products ... last month.

building
being built
built
used
using
sent
sending
being sent
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Мегамозг
17 Апреля 2016
1. The houses built many years
ago are not as convenient as the modern ones.

3. The number of apartment houses being
built
for the population of Moscow is rapidly growing.

4. The workers building this
house used new construction methods.

6. The new methods used in the
building of houses proved more effective.

7. Here are some samples of the
products of this plant being sent to different parts of the country.

8. These are the samples of products sent
last month.

 
 


К предложению 2 и 5 не подходят данные формы причастия!!!!! Может не так написала? Проверь!!!
2. What is the number of apartment
houses ... in the past few years? (должно быть - built)

5. At the conference they discussed
new methods ... in building.
  (должно быть - being used)

using, sending 
...