1 . Your light will come on the i________ you cater the door along with your favorite music or TV programmes, and you will find your dinner already prepared for you. (根据首字母单词拼写)

2 . ______(假设) that there is a lack of money, who can we turn to for help? (根据汉语提示单词拼写)

3 . It is universally _________ (承认,认为) that forests are essential to us. （根据汉语提示单词拼写）

4 . It is ________ (证明) that the challenge made no sense to us. （根据汉语意思填空）