求教With的用法

1． Because of wireless service costs plummeting in the last year, and as mobile phones are increasingly common, many people now using their mobile phone to make calls across a wide region at night and on weekends, when numerous wireless companies provide unlimited airtime for a relatively small monthly fee.

D. With the cost of wireless service plummeting in the last year and mobile phones becoming increasingly common, many people are

E. While the cost of wireless service has plummeting in the last year and mobile phones are increasingly common, many people are

答案是E

2．On account of a law passed in 1993, making it a crime punishable by imprisonment that a United State citizen hold gold in the form of bullion or coins, immigrants found that on arrival in the United States they had to surrender all of the gold they had brought with them.

B. With a law passed in 1933 that made it a crime punishable by imprisonment that a United States citizen hold

C. A law passed in 1933 that made it a crime punishable by imprisonment for a United States citizen holding

答案B

再次请教with 用法和独立主格的用法有没有什么Preferable

另外，

3． Scientists have identified an asteroid, 2000 BF19, that is about a mile side and, if it strikes Earth, it can do tremendous damage to part of the planet but probably not cause planetwide destruction.

A.     and, if it strikes Earth, it can do tremendous damage to part of the planet but

B.     and, if it would strike Earth, part of the planet could experience a tremendous amount of damage but it would

C.     and that, if it were to strike Earth, could do tremendous damage to part of the planet but would

D.     and that, if Earth is struck by it, can do part of the planet tremendous damage, but is would

E.      and that, if it strikes Earth, it could experience a tremendous amount of damage but

答案是C，请教思路