He started to learn English in 1990 and in the years ________ he kept on using it in his work.
all kinds of difficulties,the workers have made rapid progress in the construction of the World Expo 2010 Shanghai.
Too high house prices can be brought under control, ___the authorities introduce a series of regulatory policies.
.Low-carbon lifestyle is of great benefit to improve the world environment. can be enjoyed from it until you have a deep understanding of it,however.
— You may find the key to the maths problem on page 107. — Ah, it’s so simple. I wonder why I ______ of that.
For professional athletes, ________ to the Olympics means that they have a chance to enter the history books.