In the sentence What did Bill say he wants to buy?, what is an operator, binding a phonetically empty variable.

In Luanchuan County, Henan Province, for example, people subsist on 0.052 ha per capita. Government subsidies and cheap loans for agriculture are the only vehicles to keep the area afloat. Annual per capita income is approximately RMB 230 yuan. One of the three largest mines in the world—the Luanchuan molybdenum, lead, and zinc mine—attracted a deluge of miners.

This church will remarry widows or widowers, but not divorcés.

Observers noted that Chinese variolators in Vietnam exhibited one or two slight variations in their practice, however, one constant factor is that they all introduced inoculum into the nasal passages.