He started to learn English in 1990 and in the years ________ he kept on using it in his work.
Our school was ________ in 1925 and has a history of more than 80 years.
________ stopping polluting the earth ________ hope to live in a better environment.
--Why do you look pale today?--I was very ________my mother’s illness. I stayed awake last night.
After ________ series of unsuccessful attempts, he has finally passed ________ driving test.
The number of Chinese speakers in the world _________ with the development of China.