I posted the letter some time _____ the week .
It is not so difficult to learn English well. ________ you need is listening, speaking, reading and writing it every day.
—________Beijing of 2012 saw its first snowfall in the month of November.—Oh, it came as ________ surprise to us.
.________ relation between China and Russia has developed steadily since Vladimir Putin was reelected ________ president last May.
I have learned that it's taking ________ long time to become ________ person I want to be.
Because of H7N9 bird flu, all the chicken markets in Shanghai have been closed and won't open until further ________.