It was easier to move about___ the fringe of the crowd.
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.
After many experiments, finally we __________ the material we wanted very much.
The water __________ the sand soon disappeared.