On the ISS ... have to attach themselves so they don't float around.

A. astronauts  B. astronautics  C. astronautically  D. astronautical

... thought was given, but all was not approved.

A. A large number of  B. A great deal of  C. Many of  D. Many

A ... is a person who searches for valuable minerals.

A. prospect  B. prospects  C. prospector  D. prospective

Double - stars orbit ...

A. each to other  B. each other  C. each other one  D. other each one

Green and magenta ... are complementary colours located opposite each other on the colour wheel, ...

A. and blue and yellow so  B. and too blue and yellow

C. and so blue and yellow do  D. and so are blue and yellow