6. James Watt thought that his steam engine__________ animal power.

A. will replace                B. would replace  C. was replaced    D. have replaced

7. __________ its proximity to the Sun, Mercury is not the hottest planet in our solar System.

A. Due to                       B. Since                C. Even though    D. Despite

8. Young people__________ text their friends instead of speaking to them in person.

A. prefer                        B. enjoy                C. would rather    D. would like

9. Scientists wonder__________ extraterrestrials have ever visited Earth.

A. that                           B. if                      C. what                 D. where

10. “I believe that somewhere out in the universe, there are other forms of life.” “__________”

A. Why not?                           B. Absolutely not!         C. Me neither.      D. So do I.