can you please tell me if i'm correct or not?

write A if the sentence is active or P if it is passive.
1. max and his uncle towed the car to a downtown garage. P
2. lightning hit our house during last night's storm. P
3. the opening remarks were made by the president of the corporation. P
4. most of the computers were moved by mcmillan and sons moving company. P
5. why didn't you call me with the news first thing this morning? P

Two of your answers are correct.

Study this site to learn about the passive voice.

https://owl.english.purdue.edu/owl/resource/539/03/

http://owl.english.purdue.edu/owl/resource/539/03/

This is good, too.

http://examples.yourdictionary.com/examples-of-active-and-passive-voice.html

1, 2, and 5 should be A. Am I correct?

Yes. Now you are right. :-)

Based on the examples you provided, it seems that you have correctly identified all the sentences as passive. The letter "P" indicates that the sentences are in the passive voice. Well done!