1, The bill has to be paid (by him).
2, For the time being, that group is being taught by Alice.
3, The report has been finished (by her)
4, Five suspects have been arressed by the police. 
5, The little boy was bitten by the mad dog.
6, Our exercises are corrected by the teacher. 
7,The accident was seen by Mr Smith.
8, A dancing class was started last week
9, The package should be insured.
10, The bill may be paid for us ( by him)
 

 1, My sister walks to school.
2, There is a garden behind Lan's house.
3, The bank is near the post office. 
4, Our garden has many flowers.
5. Ba doesn't live in ( where is not the town ^^^ ) 

Khi gặp Nam nếu mẹ chạy tiếp tục đến trường để trở lại đúng địa điểm đó thì mất:
5h30’ – 5h20’ = 10 phút
Nếu chỉ đi dến trường thì mất: 10’ : 2 = 5 phút                              

Vậy khi gặp mẹ thì Nam đã đi hết thời gian từ lúc tan trường:

15 phút – 5 phút = 10 phút

Đáp số:10 phút 

Not only did he read the book but he also remembered what he had read

gọi số trứng gà là x( quả) , vịt là y (quả) ( x.y ϵ N* ) 
=> 3000x+ 2500y =175000
     2500x +3000y = 175000 + 7500
<=> 5500 (x+y) = 182500
        3000x+ 2500y =175000
<=> x= 65-y 
       3000( 65-y) + 2500y =175000
<=> x=25
        y=40 
 

regularly (ADV ) ở đây cần điên trạng từ chứ :D 

1, loses/ has lost 
2, want 
3, Have you ever seen 

1+2=3 
2+3=5
3+5=8
5+8=13 
............
hiểu rồi chứ  ??

MIN A = 2 <=> X= -1 
MIN B = 7/4 <=> X = -1/2
MAX E = 10<=> X= 3 
MAX P = `<=> X= 1

a, x= 5  
b, x= 1
c, x = 2
d, x =6