21.   The doctor has placed her on the Pill but when she is off it her periods do not come.

22.   The phase-out period is coming to an end for a special Chinese currency once used exclusively by foreigners and now abolished, an official report said Tuesday.

23.   The period of mourning came into force at midnight Sunday.

24.   The most dangerous period could come two decades from now when China may feel strong enough to challenge the status quo in international relations.