The lady couldn't say a word when she saw the snake, ________? A did she B didn't she C could she D couldn't she
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.
The expo is being held in Shanghai, __________ a lot of advanced technology is shown for the first time.
The manager thought __________ of these problems before he made the final decision.