1. The students ... in the Russian Museum. 2. Last

Sure! Here are the sentences filled in with the appropriate forms of the verbs:

The students were in the Russian Museum.
Last month they were in the Hermitage. There was an interesting exhibition there.
In two weeks they will be in the Tretyakov Art Gallery. They will be lucky.
My father is a teacher.
He was a pupil twenty years ago.
I want to be a doctor when I grow up.
My sister will not be at home tomorrow.
She will be at school tomorrow.
Will you be at home tomorrow?
Was your father at work yesterday?
My sister was ill last week.
She is not ill now.
Yesterday we were at the theatre.
Where is your mother now? - She is in the kitchen.
Where were you yesterday? - I was at the cinema.
When I come home tomorrow, all my family will be at home.
Is your little sister in bed now? - Yes, she is.
Will you be at school tomorrow? - Yes, I will.
When my granny was young, she was an actress.
My friend is in Moscow now.
He will be in St Petersburg tomorrow.
Where are your books now? - They are in my bag.
Where are your friends? - They are at the stadium.
What colour is your notebook? - It is black.
The library is on the right.
Let me know if you need anything else!