Choose the complex sentence. a. the sky darkened, and the wind started to blow.
b. tammy called her dog, who was barking, but the dog never came.
c. the students became quiet when the principal walked into the room.
d. answering his cell phone, cal heard his sister’s voice on the other end.

newbie construction workers preparing to work at a job cite but are first going over safety concerns?

this question is grammatically incorrect and is illegible to me so i can not answer.

at hatfield elementary school, there are 504 students in 7 classes. each class has the same number of students. what is a good estimate of the number of students in each class?