Nhanh ạ.

`20.` They were overheard to say that they didn't really like the food.

`->` Bị động với overhear:

S + tobe + overheard + to V

`21.` I expect your money to be found somewhere in your bedroom.

`->` Bị động với expect:

S + expect + O + to be + P2

`22.` We want traffic rules to be obeyed.

`->` Bị động với want:

S + want + O + to be + P2 

`23.` She wishes to be complimented on her new dress by her husband.

`->` Bị động với wish:
S + wish(theo thì) + to be + P2 + (by O)

`24.` She wished to be allowed to go camping with her classmates by her parents.

`->` wish to be `+` allowed `+` to V `+` (by O): ước được (ai) cho phép làm gì