April 23 marks World Book Day, also ________ as International Day of the Book, which wascelebrated for the first time on the 23rd of April, 1995.
_____ all that has been said, the tourists have been picking leaves.
_____ is known to everybody is ____ the moon travels round the earth once a month.
Tom ____ desperate in front of the locked door.
The science of medicine, _____ progress has been very rapid lately, is perhaps the most important of all the science.
This is the largest clock in the world, _____ the minute hand is six meters long.