Hi guys, pls help with these 3 questions..explanations for the answers will help a lot

1.The traffic advisory commission agreed that drivers with more than 3 convictions for drunk driving [u]should have permanently revoked licenses.[/u]

a. should have permanently revoked licenses
b. should have a permanently revoked licenses
c. should have their lincenses permanently revoked
d. are tho have revoked their licenses permanently
e. are to have permnanently revoked license


2. American indians point out that they are not once body: they speak hundreads of langueages and they are probably more different from one another than people who live in various European capitals.

a. from one another than people who live in various European capitals.
b. from one another than are people who live in the various capitals of Europe.
c. each from the others than people living in various European capitals
d than people who live in various capitals of Europe from each other
e. from each other as people living in the various capitals of Europe

3. Many companies in the pollution control industry, which until a few years ago has prospered on account of a national concern for environmental controls, has recently experienced sharp drops in sales and profits.

a. until a few years ago has prospered on account of a national concern for environmental controls, has
b. up until a few years ago, when prospering on account of a national concern for environmental controls, have
c. until a few yeas ago was propsering because of a national concern for environmental controls,have
d. up until a few yeards ago have prospered because of a national concern for environmental control,has
e. until a few years ago had prospered because of a national concern for environmental controls, has