1.   Federal authorities have tried to put together a criminal case against Zimmermann ever since.

2.   From Los Angeles to Athens, city authorities have tried to enact measures to limit exhaust emissions.

3.   The city authorities are trying to work out a practical solution to the problem of homelessness.

4.   Federal authorities are trying to put together a criminal case against Zimmermann.

5.   Since then, the authorities have tried to clean up the sport.

6.   The scandal has been discussed by the politburo, although the authorities have tried to hush it up.

7.   Kindred spirits reaffirmed loyalties which the authorities had been trying to suppress.

8.   Thousands of evacuees are now being moved out of the appalling desert slum at Shaalan as the authorities try to ease the tension.

9.   An inefficient banking industry is just one of the obstacles Korean authorities are trying to overcome.

10.   And Koch has devoted much of his sizable resources to defending his position because he says Turkish authorities never tried to meet him halfway.