When a person is having a lucid dream, the person’s body is 27 ; when a person daydreams, his/her body is awake.
答案：(D) asleep
語意對比：清醒夢時「身體是睡著的」，對比後文白日夢時「身體是清醒的」，asleep（睡著的）符合這個對比；apart（分開的）、absent（缺席的）、alone（單獨的）都不合。
這一格答對率 85%，是本批最容易的一格，不過值得順手把 a- 開頭這組形容詞整理起來。你可能會想：「睡著的」為什麼不用 sleeping？兩個字都對，差別在能放的位置不同。
分號後面已經把答案講白了：his/her body is awake（身體是清醒的）。前後兩半是刻意做的對比，awake 的相反就是 asleep。趁這一格建立一條規則：asleep、awake、alive、alone、afraid 這些 a- 開頭的形容詞不能放在名詞前面，只能放在 be、seem、feel 這類連綴動詞後面（劍橋 English Grammar Today）。所以我們說 The baby is asleep.（寶寶睡著了），不能說 the asleep baby；真要放到名詞前面，就得換成 the sleeping baby（睡著的寶寶）。這一格的空格正好在 is 後面，是這組字最標準的位置。
apart（分開地、相隔）、absent（缺席的）、alone（單獨的）三個字擺進去，都無法和後面的 awake 形成對比。alone 尤其要小心，它講的是「身邊沒有別人」，而不是「沒有意識」，跟做夢時的身體狀態無關。
asleep（睡著的）、awake（醒著的）、alive（活著的）、alone（單獨的）、afraid（害怕的）、fall asleep（睡著）、stay awake（保持清醒）、the sleeping baby（睡著的寶寶，要放名詞前面就用 sleeping）、be immersed in（沉浸於……）。
You must have had this kind of experience: While in the middle of a normal dream, you suddenly realize that you are dreaming. This kind of dream is called a "lucid dream." The term "lucid" means clear; lucid dreamers know that they are dreaming and 26 they are dreaming of.
It is different from daydreaming. When a person is having a lucid dream, the person's body is 27 ; when a person daydreams, his/her body is awake. Thus, daydreams are really just waking thoughts. In lucid dreams, however, we are completely immersed in the dream world.
Yet, lucid dreaming is 28 just having a clear dream. It is your chance to play around with the extraordinary abilities buried in unused parts of your brain. 29 , it is a way for you to put the deepest areas of your brain to good use while you're sleeping. You can be an everyday Jane Doe or John Smith while awake but a superhero while sleeping, 30 who you are in real life. All the obstacles of reality can be set aside and you are able to accomplish tasks that you could never manage in waking reality.