_____ are good friends. We often help each other.

Why do you look so worried — My MacBook Pro broke down and my paper _____unfinished ever since.

It ________ be the postman at the door. It’s only six o’clock.

It was not until Mum agreed to buy him a computer, _______ was his favorite, _______ the boy promised to study hard.

It ___________ that he has been ill for a long time.