Jack’s little smile on his face showed that ______.

(单选题)18.（ ） (单选题)17. （ ） (单选题)16. （ ） (单选题)______ isn’t a tragedy written by William Shakespeare. (单选题)—What made her struggle ______ a famous writer so hard?—____ (单选题)All things ______, the planned trip will have to be called o (单选题)Statistics ______ a rather modern branch of mathematics. (单选题)A research shows that raising a pet can ______ people ______ (单选题)—Goodbye, John. Come back again sometime.—Sure. ______. (单选题)The letters for the manager ______ on his desk but he didn’t