【推荐1】It was difficult to __________how many trees had been destroyed.
很难估计有多少树被毁。

【推荐2】________ ________ ________ 80% of all conversation in English is small talk. 据估计，英语中 80%的谈话都是闲谈。

【推荐3】句型公式：it is estimated that... 据估计……
教材原句：Today, ________about 60 percent of domestic rice consumption in China is comprised of crops generated from Yuan's hybrid strains，and his strains have allowed China's farmers to produce around 200 million tons of rice per year.
据估算，现在中国国内消费的稻米有大约60%来自袁隆平的杂交水稻品种形成的作物，这些品种(形成的作物)让中国农民每年能够生产出大约两亿吨稻米。

【推荐1】Whether they’ll go or not hasn’t been decided. (用it句型改写句子)

【推荐2】在中国，当你参加宴会时，注意餐桌礼仪是至关重要的。
________ ________ ________ you ________ mind your table manners in China when you attend a dinner party.

【推荐1】________ ________ ________ ________ ________(你真好) to help me out of trouble. （根据汉语提示完成句子）

【推荐2】______ ______ ______ ______（不容否认的）that she is very efficient. （根据汉语意思填空）