She will never forget the days ______ she spent in Beijing.
Today , we’ll discuss a number of cases______beginners of English fail to use the language properly .
People who can’t ___________ between colors are said to be colorblind .
. It was the fact _______his father was ill in hospital_________ worried him and kept him awake for a whole night .
. The Town Hall_________in the 1800’s was the most distinguished building at that time .
The Postal Service announced Tuesday it had made a significant _______in getting machinces to read handwriting .