= 89. ( 23 - 17+ 4)

= 89. 10

= 890

A

1.bakery

2.nationality

3.dangerous

4.length

5.pollution

B A B D

33.oldest

34.students

35.bookshelves

36.once

37.ninth

38.better

1.D

2.C

3.B

4.A

A

1.What's the matter with you? 

2.What are you doing with matches? 

3.Why shouldn't she run down the stairs? 

4.He should go to the dentist

C