15. _____ a spoonful of soil can tell us so much about the structure and early history of the moon.

A. Remarkable B. Quite remarkably

C. It is remarkable that D. It is remarkable fact that

16. _____ you nominate will be elected.

A. Who B. Whom C. Whomever D. That’s

17. _____ book you borrow must be returned within a week.

A. What B. Which C. Whichever D. That’s

18. _____ of us gets home first starts cooking.

A. Who B. Which C. Whichever D. Anyone