Unit 2 What is happiness to you單元復習學案
a.by nature b.in return
c.in case d.by chance
解析：選c。句意：我猜我們以前早就談論過這件事了，以防萬一我還要再問問你。by nature，“天生地”；in return，“作為回報”；in case，“以防萬一”；by chance，“偶然的”。
25.________fire，all exits must be kept clear.
a.in place of b.instead of
c.in case of d.in spite of
解析：選c。句意：為防火災，所有疏散通道務必暢通。in place of，“代替”；instead of，“代替，相反”；in case of，“萬一，以防”；in spite of，“盡管”。根據句意，c項正確。
26.the openair celebration has been put off________the bad weather.
a.in case of b.in spite of
c.instead of d.because of
解析：選d。句意：戶外慶典由于惡劣天氣被推遲了。in case of“萬一”；in spite of“盡管”；instead of“代替”；because of“因為”。
27. (XX年江蘇南京高考復習質量檢測) leave your key with a neighbor________you lock yourself out one day.
a.ever since b.even if
c.soon after d.in case
解析：選d。句意：留一把鑰匙給鄰居，以防有一天你把自己鎖在門外。since“自從……以來”；even if“即使”；soon after“不久之后”in case“以防，以免”。根據句意d項正確。
28.(XX年高考北京卷)you may use the room as you like________you clean it up afterwards.
a.so far as b.so long as
c.in case d.even if
解析：選b。句意：你可以任意使用這個房間，只要你過后打掃干凈即可。so far as“就……而言”；so long as(＝as long as)表示唯一條件“只要”；in case“以防，萬一”；even if“即使，盡管”。
2【教材原句】 by the time she competed in the gymnastics tournament at the new york goodwill games，she had been a dedicated junior gymnast for eleven years.(p18)
到她參加在紐約舉行的友好運動會的體操錦標賽時，她已是一名有十一年資歷的優秀的青年體操運動員了。
【句法分析】 當by the time引導的從句使用過去時時，主句通常用過去完成時。這時by the time表示“在……之前；到……的時候”，主句則表示在此時間之前某個事件已經完成。
但是，當by the time引導的從句用過去時時，主句有時也用一般過去時，這時by the time常表示“在……時候，到……時候”。
①by the time we walked five miles，he was exhausted already.當我們走了五英里時，他就已精疲力竭了。
by the year/by the time/by the end of后跟的時間(或從句)如果是將來時間，主句中常用將來完成時，即will/shall have done。
②life will certainly have become far more mechanized by the year 2100.
到21XX年，生活必將變得更加機械化。
29.by the time he realizes he________into a trap，it’ll be too late for him to do anything about it.