28 Coca-cola  drunk in the 21 century 
29

=> The research was given up after three hours.
30
The matter should be looked into
31 He was seen steal your car
32 Drivers are advised to use an alternative route by police.

 

28. People drink coca-cola in the 21st century.
Coca - Cola will continue to be drunk in the 21st century.
29. They gave up the research after three hours.
The research was given up after three hours 
30. Someone should look into the matter.
The matter should be looked into
31. People saw him steal your car.
he was seen stolen your car
32. Police advise drivers to use an alternative route.
drivers are advised to use   an alternative route.
33. She advised me to sell that house.
i was advised to sell that house 
34. My pupils can't do these exercises quickly.
these exercises can not be done quickly by  My pupils