She demanded that he _____ the books he borrowed from her.
______ no doubt that 100 years ago animal testing was cruel but today animals in experiments are very well taken care of.
I try to understand __________ that prevents so many Chinese from being as happy as one might expect.
It’s raining heavily . Little Mary felt cold , so she stood ______to her mother .
China understands the situation and needs of underdeveloped countries on the issue of climate change and urges developed countries to support them______ technology and finance.
______ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.