Verified answer

1:

1. The flowers have been watered by the gardener.
2. English is spoken in the USA.
3. The telephone was invented by Bell.
4. This machine is used for cutting cheese.
5. Some roses had been sent to her before he left for London.
6. He has been arrested by the police.
7. A new house is being built by the farmer.
8. A new supermarket will be opened next week.
9. The article was being translated when I arrived.
10. Mark was invited to the party.

2:

1. will be taken

3. were held

4. are grown

5. was discovered

6. has just been written

7. are being built

8. was bought

9. will be opened

10. are made

11. has been produced