This one: "Lee noticed a problem and alerts a teacher".
The second verb should not have been changed to present tense.
You should change the verb alert to past tense: "Lee noticed a problem and alerted a teacher".
Answer:
I think it's explain because he asked him to answer him
The answer is C. fire barrier
♥ Your answer is "i'm"
♥ The object in this sentence is "you"
♥Hope this helps!♥
Answer:
Give me some time and i will have it ready. I will post it for you and add the link here.
Explanation: