“Thats one small step for a man, one giant leap for mankind.” During NASAs Apollo program, 12 American astronauts explored the lunar terrain. The last U.S. trip to the moon (30) ______ in December 1972. -------------------- Bạn hãy đọc đoạn văn 1 trên và trả lời câu hỏi. The space agency hopes to (26) _____ humans to the moon again by 2020