Students are ______for new knowledge to suit themselves to the future jobs in various fields_______ which they are unfamiliar.
How close parents are to their children ________ a strong influence on the development of the children's characters.
—Was it at 11 o'clock ________ your father came back last night? —Yes, he is always coming back so late.
Scientists are still wondering ________ the Egyptians built the pyramids so long ago.
________ about the man wearing sunglasses during night that he was determined to follow him.
I am certain by no means ________ his word since he has promised an amount of money to the poor.