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A. is cleaned B. was cleaned C. are cleaned
( ) 5.The children ______by the teachers at school.
A. take care of B. are taken care
C. are taken care of
Choose the best answer.
Review
一般现在时的被动语态结构：
am/is/are +过去分词
c
c
A
c
c
Unit 4 Amazing Science Topic 1 When was it invented ?
Section A
Guessing games
Listen carefully and guess what it is .
A: What’s the lock made of?
B: It’s made of metal.
A: What’s it used for?
B: It’s used for locking the door.
Follow the example and make up similar conversations.
lock / metal
Pair-work
paper/wood
A: What’s the paper made from?
B: It’s made from wood.
A: What’s it used for?
B: It’s used for writing on.
n.锁 v.（用锁）