=>
33. Their own styles of hair were made at home last night.
34. Peter hasn't been seen since the day of the party.
35. She was tired, so she didn't go to school.
36. I wish your friend could stay with us longer.
37. It's been about 6 months since Cong Tri, a stylist designed new styles of Ao dai.
38. They spent a year seeing that movie on TV.
39. Spring rolls are made by Mrs.yen, aren't they?
40. No continent on Earth is older than Europe.

33. They made their own styles of hair at home last night. 

=> Their own styles of hair were made at home last night.  

34. No one has seen Peter since the day of the party. 

=> Peter has not seen since the day of the party. 

35. Because she was tired, she didn't go to school.

=> She was tired, so she didn't go to school.

36. It's a pity your friend can't stay with us longer.

=> I wish your friend could stay with us longer.

37. Cong Tri, a stylist has not designed new styles of Ao dai for 6 months.

=> It's been about 6 months since the last time Cong Tri, a stylist designed new styles of Ao dai

38. It took them a year to see that movie on TV. 

=> They spent a year seeing that movie on TV. 

39. Mrs. Yen makes spring rolls perfectly, does she?

=> Spring rolls are made perfectly by Mrs. Yen, aren't they ?

40. Europe is considered the oldest continent on Earth.

=> No continent on Earth is considered older than Europe.