请各位大虾帮帮小弟............. APEX TOEFL GRAMMER QUESTIONS UNIT Reinforcement2 16.Women {have done} advances {in reaching} high positions in business, but {there} are still {few} women in goverment. A):A 17.{Since} no one {else} has volunteered, Sheila {will be} responsible {to supply} food for the trip. A) 18.{That} a vaccine for polio was discovered in so {short time} was {one} of the {most} astonishing events in modern medical histroy. A):B 19.{The country's} two most powerful leaders tried to {take} the journey {a little easier} by going on the road {themselves}. A):B 20.Lillian D. Wald was an ardent {pacifist}, and {participants} in peace movements {held} her in {big} regard. A) 21.{When}, in 1793, Eli Whitney invented the cotton gin, he {did} a great contribution {to the} economy {of the} south. A):B 22.Her cough so {aggravated} her condition that the doctor had to {bring} her to the hospital where she {lay} in the ward awaiting {further} treatment. A):C 23.The sound of the party was almost {deafening} when Sidney {entered into} the room, but soon he was able to {distinguish} Nancy's voice from the {other's}. A)