The boy said ________ couldn't he work out the problem but his teacher didn't know how to do it.
She knew nothing about his journey _______ he was likely to be away for three months.
“How did the robber get in?” “______ an open window on the first floor.”
_______ reading the letter, what has he done?
They promise that the work would all be finished _____ next week.
_____ their inexperience, they’ve done a good job.