______ the work is difficult, all the workers are keeping on working .

what a pity! All the tickets weresold out――I’m sure we_______ two, but you were notquick enough

are you sure your aunt ___ back from America—Yes. My mother ___ me. I am going to see her now.

_____ is no doubt _____ John’s knowledge offirst aid saved Ms Slade’s life.

Do you know how long it has been _________service