Unit 4 Inventions and Inventors

she is thought to be the top student in our class.
jane is thought to be busy preparing for the exam.
2. however we are also warned not to ask for pretty colors, because the car will come in gray only.
warn
no one warned him of the danger.
i warned her not to get close to the dog but she wouldn’t hear of it.
3. other experts are sure that the future will be happy.
be sure that…
i am sure that smoking will hurt you.
are you sure that john will come this afternoon?
4. if gas is in short supply, the super car will run on water.
be in short …
the cheaper it is, the better. i’m short of money.
on 靠
he finds it difficult to live on his salary.
they live mostly on vegetables from their garden.
5. as a rule, soft fruits like strawberries, etc, are difficult to freeze.
as a rule 一般來說，通常是
as a rule, she goes out early every evening looking for work.
as a rule, we get home at 6.
6. you should  be careful the first time you wash your shirt because the blue color might come out and mark the white part.
come out 開花，出版，退色，計(jì)算出來
this magazine comes out monthly.
some flowers have begun to come out.
i washed the shirt twice but the ink still hasn’t come out.
7. observe 觀察
i observed a letter on the table.
did you observe anything strange in that boy’s behavior?
 
［課堂練習(xí)］
i. 單選。
1. have you ever       this kind of moon cakes?
  a. eat                 b. eats               c. eating                d. eaten
2. the knives are used       cutting things.
  a. in                   b. to                 c. for                    d. of
3. they are used for      the style of a sh oe.
  a. change           b. changes         c. changing            d. changed
4. –must i stay at home, mum?
  - no, you      .
  a. needn’t           b. mustn’t         c. don’t                 d. may not