Computers ... very efficient, a) is b) are с) am Peter

Computers ... very efficient, a) is b) are с) am Peter ... very hard-working, a) to be b) is c) are Banks ... open till six o'clock, a) am b) is c) are They ... in the house right now. They are in the library. a) are b) aren't c) is not I ... a student. I am an engineer, a) am b) is c) am not