Change the following sentences into passive voice

II.change the following sentences into passive voice
1. she will visit her mother this weekend.
2.the secretary must send this packet tomorrow.
3.he should clean up his apartmend.
4.i have to improve my English.
5. you must learn your lessons tonight.
6.we are going to organize a party tonight.
7.i've never done this exercise before.
8.you should wear gloves when using an electric saw
9.have they constructed these houses quickly?
10.somebody has locked the box and i can't open it.