Questions Simple Present with 'to be' (am, is, are)

Fill in 'am', 'is' or 'are'.

I late?

CDs expensive in your country?

your mother at home?

the students interested in sport?

the skateboard club open today?

Jake from London?

your father at work today?

these your shoes?

it cold in your room?

there a lot of people on the train?