The old man often looked back on the past days ________ he worked hard to make a living.
Martin was sick with a strange fever; _______, he could neither eat nor sleep.
The company will be left in the _______ of the secretary when the manager is away.
It was last night_______ Mr. Brown came back to his hometown from Africa.
To be an excellent runner, you must be prepared to _______ much hard work.
It turned out that one of the children I thought a girl was _______ a boy.