一、用过去时或现在完成时填空:1. “_______ you ________ (have) lunch ?” “Yes.”“When _______ you _______ (have) it?” “I _____ (have) it at 12:00.”2. “______ you _______ (write) a letter to your aunt yet?”“Yes, I _____
Unit 5 Pioneers of FlightKey to ExercisOpenerA Mighty Airplane Built by Howard Hughes in 1947LengthIt was 220 feet long.HeightIt was higher than a five-story building.老年补肾Weight手机开不开机怎么办It weighed a