1. Learning a foreign language has become a serious business for people in China - not least for its leading figures.
2. No - you become a serious foreign policy person in Washington by dint of meeting two criteria.
3. You may be thinking that you can become a serious foreign policy person by often being right about foreign policy.
4. This helped form the coexistence of surplus capital and surplus labour which today has become a serious structural problem that haunts Chinese economy.
5. China's rise would become a dreamy illusion if serious domestic chaos or international crises make China incapable of tiding over this period peacefully.
6. The documentary discovered an interesting phenomenon - people change their childhood ideals and become very serious in their chosen career.
7. So corruption and clandestine operations have already become a serious problem for " legal " auctions conducted by registered auctioneers.
8. " Bird flu has become a serious new contagious disease threatening human health, " he said.
9. Despite the increasing adoption of copyrighted software among enterprises and organizations, unauthorized copies within organizations has become another issue meeting serious concerns from software companies.
10. The destruction of the environment has become a social problem no less serious than unemployment, energy shortages or the income gap.