填空题 There was a knock at the door. It was the second time someone ______ me that evening.

填空题 We don't need air conditioning, ______.

填空题 The ancient Egyptians ______ the hour as one-twelfth of the time from dawn to dusk.

填空题 The time is not far away ______ modern communications will become widespread in China's vast countryside.

填空题 This difficulty did not in the least shake his ______.

填空题 We must adhere to the ______ that everyone must be treated fairly.

填空题 With regard to its population, China is poor in natural ______.

填空题 Nuclear science should be developed to benefit people ______ harm them.

填空题 There are still some people in the world who ______ cold, hunger, and insufficient clothing.