There is someone in the classroom. It _______the teacher he always gets there before students.

• can't be

• must be

• must is

I'm not sure but he ________Marley's cousin.

• must be

• can't be

• might be

Isabelle _________ 10 years old, she looks much older than that.

• can't be

• must be

• may be

I hear something outside the house. It _______my neighbor's cat, I hope it is.

• can't be

• mustn't be

• might be

Can you see that teacher over there? He _______ our new teacher.

• might be

• can´t be

• couldn't be

That teacher ________our new teacher she is 1st grade teacher.

• might be

• can't be

• must be

It _______ someone in the classroom because the lights are on.

• must be

• might be

• can't be

That girl over there ________ Katie, I'm not sure, but I think she is.

No, they _______ our teammates, they are working with other students.

My mom sounds odd, she ______upset because of my final grades, she saw them in the morning. I'm positive she is.