( ) 1 Mr Ding is a(n) ______ teacher.
a English　　b maths　　c science
( ) 2 They are talking about ______ in the lesson.
a air　　b water　　c food
( ) 3 Clean water ______.
a has no colour or smell　　b has a bad smell　　c is black
( ) 4 The water in the river behind Liu Tao’s home is ______.
a clean　　b white　　c dirty
( ) 5 Why does the water have colour and smell?
a Because it can change colours.　　b Because it becomes black.　　c Because it is polluted.

1 c 2 b 3 a 4 c 5 c

( ) 1 Keeping our city clean is important.
( ) 2 Banana skins should go into a blue bin.
( ) 3 The passage shows different ways to keep the city clean.
( ) 4 These things are difficult to do.

1 T 2 F 3 T 4 F