1 . 海洋是地球的基础。海洋不仅为我们提供了海洋资源，而且还保持了自然的平衡。
The ocean is fundamental to our planet. ________________. (倒装句)

2 . 互联网教育资源丰富，爱学习的人可以获得各种免费课程，足不出户，学遍天下。(So放句首倒装)
_______________that those loving learning can have free access to various courses and learn everything without going out.

3 . 时间是你最有价值的资源，尤其是在考试中。
Time is your ________, especially in examinations.

4 . On the earth the ______ ______ ______（资源有限）.That’s why we have to make an attempt to recycle those that can be reused. (根据汉语提示完成句子)