Father is     us a meal . We may wash our hands and     the meal.

A．preparing ; prepare

B．preparing ; prepare for

C．preparing for ; prepare

D．preparing for ; preparing for

Why did the United States first launch satellites into space a. To improve navigation for warplanes and warships. b. To guide smart bombs that home in on moving targets. c. To collect meteorological data. d. To sense remote volcanic eruptions.