students to imagine whether such a world is fit for living in.

　　In Speaking, the teacher mainly offers the students the chance to talk about the future and learn to how to express prediction.

　　In Writing, the students are expected to learn to describe a person in their imagination to get the students not only to be familiar with description but also to form the good habit of imagining.

　　In Summing up and Learning tips, let the students learn to sum up what they have mastered in this unit, including words, expressions, grammar and what to know about the future. The purpose of this is to get the students to know what they have learned and what need to be learned in the future. Besides that, some advice is also given to the students on how to write down notes.

The new words and expressions to be learned in this unit are: vehicle, carriage, private, settlement, impression, constant, constantly, previous, tablet, capsule, opening, surrounding, lack, ache, mask, bend, press, swift, master, sight, flash, optimistic, length, extraordinary, helmet, assist, agency, skip, require. take up, remind...of, lose sight of, catch sight of, speed up, assist in, space agency, as a result, suffer from, be similar to, be well-known for, as though, in no time, provide...with, fall fast asleep, search for, go soft, speak in whispers, mix with, wave about, shake from side to side, depend on, put on, get lost, as if by magic, plenty of, in all directions.