collapse 2. 飞火箭到月亮 3. In the space station 4. 养一只宠物 5. repeatedly 6. 高飞至天空 7.loos like 8. wake up 9. disagree 10.on vacation 11.hundreds of 12.多种不同形状 13. both..and 14. look for 15 able to do. 16. 看起来不太可能 17.One hundred years ago 18. in life 19 像人类 20 无聊.