He found it hard for Alan to focus on his teachers for longer than five minutes, _________ if the lecture was boring. 

She seems_     happy in her new job since there is nothing troublesome to bother her. 

He is thought to be one of the most famous writers________.

---- You don’t go to that supermarket quite often, do you?  ---- No, I only go there ______ because it’s too far away from my house.

 The melon the Smiths served at dinner would have tasted __________ if it had been put in the fridge for a little while.