To be-modal verbs

My grandmother was ... teacher.

She ...  so beautiful!

They ....... not Americans.

The cup ..... broken long time ago.

I'm going to take .... dog for a walk.

Paris is .... interesting city.

I’m at .... library.

We ..... speak Japanese.

’m sorry, but I ...... come to the party. 

Students ..... leave the classroom before the bell rings

I .... leave now.

We .... at school yesterday.