The school rules state that no child ___ be allowed out of the school during the day , unless accompanied by an adult .
—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.
It is comforting to see that ________, we are doing our part for the environment.