Lotfia ElNadi flew ……… in an international race from Cairo to Alexandria.a. Single b. separate c. lonely d. solo

The best option to complete the sentence is d. solo.

In this context, "solo" is used to indicate that Lotfia ElNadi flew alone in the international race. The other options do not fit grammatically or contextually.

• a. Single suggests a status or individual designation but does not convey the idea of flying alone.
• b. Separate does not apply to the action of flying.
• c. Lonely implies an emotional state rather than the act of flying alone.

Thus, the sentence reads: "Lotfia ElNadi flew solo in an international race from Cairo to Alexandria." This indicates her independence and capability as a pilot, especially noteworthy given her historical significance as one of the first female aviators in the Arab world. Using "solo" emphasizes her individual achievement in what would have been a challenging endeavor, reflecting both her prowess and the pioneering nature of her participation in aviation.