The book was written in 1946, _______ the education system has witnessed great changes.
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.