HELP!!! I WILL GIVE YOU BRAINLIEST.

The sentences below are in passive voice. Rewrite them in active voice.

1) Kirsten was applauded by the audience after her solo.
2) The toilet was clogged by the dog dropping her ball into it.
3) Oil was substituted when we ran out of butter.
4) Soon after the doctor gave Kelly the medicine, she was cured.
5) The dictionary was used by every student in class.