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27. Up to now, _______ space exploring still remains _______ very risky, complex, and
expensive endeavor.
a. the / the b. a / the c. a / Ø d. Ø / a
28. Within _______ few years, _______ private space travel has gone from concept to reality.
a. Ø / an b. the / the c. the / a d. a / Ø
29. With its long days, lack of _______ atmosphere, and wide-open spaces, _______ moon
would also make an ideal place to put massive solar power plants.
a. Ø / a b. an / the c. the / a d. an / Ø
30. _______technology is already present in the form of computers, printers, scanners, handheld
devices, wireless technologies, and Internet connections.
a. A b. An c. The d. Ø
expensive endeavor.
a. the / the b. a / the c. a / Ø d. Ø / a
28. Within _______ few years, _______ private space travel has gone from concept to reality.
a. Ø / an b. the / the c. the / a d. a / Ø
29. With its long days, lack of _______ atmosphere, and wide-open spaces, _______ moon
would also make an ideal place to put massive solar power plants.
a. Ø / a b. an / the c. the / a d. an / Ø
30. _______technology is already present in the form of computers, printers, scanners, handheld
devices, wireless technologies, and Internet connections.
a. A b. An c. The d. Ø