A. advanced B. headache C. let's D. shorter A. concentrate on B. confirm C. undeclared D. on foot A. dinosaur B. rainfall C. actress D. responsible A. close B. secure C. headband D. broom A. inflatable B. as long as C. enough D. adverse A. this B. recover C. shall D. sweet A. remains B. inrush C. irritation D. by car A. strata B. take a chance C. right away D. museum A. graph B. chorus C. instead D. by bike A. reconstruct B. horde C. robot D. African American