I have to convert the following sentences from active to passive voice and vice versa:
A) Most insomnia is caused by stress.
B) Health chiefs have voiced concerns that Britain is fast becoming a nation of sleeping pill addicts.
I think that the conversions are:
A) Stress causes most insomnia.
B) Concerns that Britain is fast becoming a nation of sleeping pill addicts have been voiced by health chiefs.
A) Are my conversions correct?
B) This "most" on sentence A causes problems to me. Specifically, I think that the way I have written sentence A doesn't make any sense as far as "most" is concerned.
C) Can I rephrase my conversions so that minimum reordering of phrases is present and if yes, how? (you can see that I have completely changed the ordering of certain phrases on the sentences)
D) The "is becoming" verb on sentence B can't be converted, right?