1.   Moving quickly to mount the strongest possible challenge for the seat long held by Sen.

2.   Their strongest challenge is likely to come from a Leander quad containing the Olympic gold medallist Steve Redgrave.

3.   As a result, the board is now facing perhaps its strongest challenge ever, in the form of a torrent of calls for the system to be overhauled.

4.   His strongest challenge ahead may come from even more nationalistic figures, and Milosevic may have to answer for the presence of foreign troops in Kosovo.

5.   Indeed, as a group, these books mount the strongest possible challenge to some of the values with which history has come to be associated in recent decades.

6.   It presents the Yeltsin administration with the strongest challenge to its authority of any current part of the nation.

7.   Lawyers who specialize in art law said it was perhaps the strongest challenge so far.

8.   The finding throws out the strongest challenge yet to the widely held belief that heating from mobile phone signals is their only potential threat to brain cells.

9.   The strongest challenge in the Jim Dandy field of seven will most likely come from A P Valentine, the runner-up in both the Preakness and the Belmont.

10.   The strongest challenge came from the sturdy marigold, championed by Senate Republican Leader Everett Dirksen.