`~rai~`

`text{5.We are being followed.}`

`text{6.Their teachers are going to be sent letters.}`

`text{7.It is known that the expedition reached the South Pole in May.}`

`text{or:The expedition is known to have been reached the South Pole in May.}`

`text{8.It has to be seen to be believed.}`

`text{9.Little boys used to be made to climb the chimneys to clean them.}`

`text{10.He doesn't like being laughed at.}`

`B.`

`text{1.An orange can't be eaten if it hasn't been peeled.}`

`text{2.You can't be put in prison if you haven't been tried.}`

`text{3.He was brought up by his grandfather and his education was got in HCM City.}`

`text{4.Before printing was invented,everything had to be written by hand.}`

`text{5.No thing has been moved since you were sent away to be cared.}`

`Ex 8:`

`text{1.A student threw the stones.}`

`text{2.A strong police guard was escorting the referee from the football field.}`

`text{3.Egyptian and Greek sailors have used carrier piegons.}`

`text{4.A sudden increase in water pressure would break the dam.}`

5: We are being followed
6: Letters are going to be sent to their teacher
7: The expedition is known to reach the South Pole in May
8: It has to be seen to believe it
9: Little boys used to be made to climb the chimneys to clean them
10: People isn't liked to laugh at him

B:

1: An orange cannot be eaten if it hasn't been peeled
2: You cannot be put in prison if you haven't been fried
3: He was brought up by his grandmother and his education was got by him in HCM city
4: Before printing was invented, everything had to be written by hand
5: Nothing have been moved since you were sent away to cure you

Ex 8:

1: A student threw the stones
2: A strong police guard was escorting the referee from the football field
3: Earl Egyptian and Greek sailors have used carrier pigeons
4: A sudden increase in water pressure would break the dam