passive sentences - correct?

[Anita311]

It would be great if someone could look this over. Thanks in advance!!

Make these sentences passive. Only use by if it is important to say who performed the action.

1. They manufacture all our new models in Singapore.
All our new models are manufactured in S.

2. We have reduced product launch time dramatically.
Product launch time was reduced dramatically.

3. The CEO evaluated the marketer’s ideas regularly.
The marketer’s ideas are evaluated regularly (by the CEO)

4. Scientists were testing the new drugs.
New drugs were being tested (by s.)

5. An independent ethics committee is going to approve the trials.
The trials are going to be approved (by an indep. Eth. Com)

6. I think we should discontinue this range of products immediately.
This range of products should be discontinued immediately.

7. Simcotel is developing a very exciting range of mobile phones.
A very exciting range of mobile phones is being developed (by S.)

8. We have to apply for special permission to carry out the tests each time.
Each time, special permission has to be applied for to carry out the tests

9. Our engineers could make some modifications.
Some modifications could be made (by our engineers)

10. Evans Engineering will build the prototype.
The prototype will be built (by EE)

[Ludovician]

It would be great if someone could look this over. Thanks in advance!!

Make these sentences passive. Only use by if it is important to say who performed the action.

1. They manufacture all our new models in Singapore.
All our new models are manufactured in S.

2. We have reduced product launch time dramatically.
Product launch time was reduced dramatically.

3. The CEO evaluated the marketer’s ideas regularly.
The marketer’s ideas are evaluated regularly (by the CEO)

4. Scientists were testing the new drugs.
New drugs were being tested (by s.)

5. An independent ethics committee is going to approve the trials.
The trials are going to be approved (by an indep. Eth. Com)

6. I think we should discontinue this range of products immediately.
This range of products should be discontinued immediately.

7. Simcotel is developing a very exciting range of mobile phones.
A very exciting range of mobile phones is being developed (by S.)

8. We have to apply for special permission to carry out the tests each time.
Each time, special permission has to be applied for to carry out the tests

9. Our engineers could make some modifications.
Some modifications could be made (by our engineers)

10. Evans Engineering will build the prototype.
The prototype will be built (by EE)

Sieht perfekt aus. Gut gemacht

Gibt es einen Grund, weshalb Du die Wortstellung bei Frage 8 benutzt hast? Ich wuerde sagen es geht ein bisschen besser mit "Special Permission has to be applied for each time to carry out the tests".