they

 They have developed techniques which are _______ to those used in most factories.

Old people are not interested in pop music. They are ________the times

Mike’s cousin is the same age ___________ him. They get on well ______ each other.

Don’t worry about the kids. I think they can do it__________

They had so ______ in common that they soon became good friends

Having heard so much about Mr. Smith, they were _______ to meet and have a chat with him.