【推荐1】People are killing large numbers of wild animals, ____________________ (使食物链处于危险之中). (根据汉语提示完成句子)

【推荐1】The problems with this nation can ________ (被追溯到……) the Second World War. （根据汉语提示完成句子）

【推荐2】It seems that we have to accept the result and make a good preparation to have another try.
                      earlier, I could have done something to avoid this accident. (inform)
看来我们必须接受这个结果并做好再次尝试的准备了。要是我早点得知的话，就可以做些什么来避免这场事故了。

【推荐3】With the college entrance exam drawing near, every minute should______________to work at our lessons.(use)
随着高考的临近，每一分钟都应充分用来学习功课。

【推荐1】Today, I’ll give you a brief introduction to some aspects of film-making you might __________________________(不熟悉). (根据汉语提示完成句子)