7.the(student).......students

10.most(housewife)........housewives

12.(goose)...........geese......like water.

13.(piano)____pianos______are expensive.

14.some (policeman)........policemen..........

15.where is my (luggage)______luggage(dt ko đếm đc)_____?

B

B

C

B

A

A,y=1

B,y=0 hoặc 1

=2^24.4^5/(2^6)^5

=2^24.4^5/2^30

=2^10/2^6

=16

x+1/9=1/25

x=1/25-1/9

x=-16/225

A,=3km526m

B,=55kg221g
C,=5,04m2

D,=5,25giờ

Spend+v-ing chứ ko phải to+v nhà bạn