11.   Farmers in Afghanistan grow opium poppies, which produce the sap used to make heroin.

12.   Heroin is made from opium.

13.   Hundreds of soldiers arrived in a remote corner of northwestern Pakistan on Tuesday to destroy opium crops, the raw material used to make heroin.

14.   Most of the opium used to make heroin in grown by peasant farmers in lawless Afghanistan.

15.   Opium is the raw material from which heroin is made.

16.   Poppy, the raw material used to make heroin, is one of the largest cash crops for poor Afghans.

17.   The narcotic is the raw material used to make heroin.

18.   The plane was spraying herbicide on crops of opium poppy, the plant used to make heroin.

19.   The opium used in making heroin is grown in neighboring Afghanistan.

20.   The U.S. government says the production of opium, the raw material in making heroin, is up significantly in Pakistan.