11.   At the same time the United States has tightened restrictions on caviar imports to protect the fish.

12.   A few radicals might even want to tighten restrictions on guns and ammo.

13.   A. We have tried to maintain discipline, and this market just tightens the restrictions on what we will do.

14.   But if the government tightens restrictions on capital outflow in an effort to shore up dollar reserves, companies might be unable to meet obligations.

15.   But most states have dramatically tightened restrictions on buying and possessing sawed-off shotguns.

16.   Chilean stocks fell to their lowest level in a month after authorities tightened restrictions on foreign investment in financial instruments, including shares.

17.   Chilean stocks fell to their lowest level in a month after authorities tightened restrictions on foreign investment, some of which may have been filtering down to shares.

18.   City officials, less sanguine, tightened restrictions on tree-cutting.

19.   Concerned that ETA, the Basque separatist group, may try an attack, Spanish authorities have tightened border restrictions and are searching cars entering the city.

20.   For example, many malls have tightened restrictions at loading bays, forcing retailers to preschedule deliveries and turning away unexpected shipments and deliveries.