9.  The results are hardly _______; he cannot believe they are accurate.

    A) credible C) critical

    B) contrary D) crucial

10. This new laser printer is _______ with all leading software.

    A) comparable   C) compatible

    B) competitive  D) cooperative

11. The ball _______ two or three times before rolling down the slope.

    A) swayed   C) hopped

    B) bounced  D) darted

12. He raised his eyebrows and stuck his head forward and _______ it in a single nod, a gesture boys used then for O.K. when they were pleased.

    A) shrugged C) jerked

    B) tugged   D) twisted

13. Many types of rock are _______ from volcanoes as solid, fragmentary material.

    A) flung    C) ejected

    B) propelled    D) injected

9. A  10. C 11. B 12. C 13. C