When we sleep is cultural as biological-and practices differ greatly round the globe.
There are 51 students in Class Three, __________ failed in the test.
The Dragon Tower, from __________ top visitors can enjoy a good __________ of Harbin ,attracts hundreds of tourists every day.
There are many people standing in front of the government building, __________ some are peasants.
Jia Sixie wrote down his advice in a book called Qi Min Yao Shu,__________ was considered an important summary of the knowledge of farming.
The factory is no longer __________ it was 5 years ago, __________ it was so poorly equipped.