When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
The company,__________ in 2003, is one of the most famous compa-nies.
—How often do you eat out? —__________,but usually once a week.
I was so familiar with him that I recognized his voice __________ I picked up the phone.
__________ in 1993, the EU, together with the US, is one of the two largest economies in the world.
Linda worked for the Minnesota Manufacturing and Mining Company,__________ as 3M.