When ______ about the possibility that Justin was taken by aliens, Detective Sam Peterson said that there was no hard evidence about this.
John was so sleepy that he could hardly keep his eyes ___.
--___ do you want? --I want a book on history.
Shortly after the accident, two ___ police were sent to the spot to keep order.
Mr. Wang said that he ___ next year.
In the dark street, there wasn’t a single person ___ she could turn for help.