Marcus - Error Identification 3

Is the sentence below correct:

When you send the forms, you should included a photograph.

Is the sentence below correct:

The teacher gave each of the student a test paper.

Is the sentence below correct:
It's important for every students to have a dictionary.

Is the sentence below correct:

Every furniture in that room is made of wood.

Is the sentence below correct:

People's ideas about love change.

Is the sentence below correct:

We have a lot of work to do.

Is the sentence below correct:

One of my mother's rings was also stolen.

Is the sentence below correct:

She has a lot of jewelries.

Is the sentence below correct:

The thieves must had stolen the cellphone.

Is the sentence below correct:

Our group must climbed the hill.