Many scientists believe that life begins in the ocean long ago. For age man used the ocean to discover and explore new lands. Now man spends a great deal of time or money discover the ocean. We know it is rich at minerals which the world need. We know too that it contains a plenty of food for all the people in the world. We know that if the salt were taken from it, it’s water would turn the deserts into rich farm lands. We know a great deal about this land frontier, as it has called. But we still need to learn many more about it.begins---began
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(答案→)begins---began
解析：文章介绍海洋是人类的发源地，现在人们正在发现探索更多的海洋，因为它对我们非常重要。
【小题1】很多科学家认为人类是在很多年前在海洋开始的，时间是long ago和一般过去式连用begins---began
【小题2】有很多年，人类用海洋探索发现新的陆地。For ages有很多年
【小题3】现在人们花大量的时间和钱寻找海洋。Time和money是并列的：or---and
【小题4】spend time and money （in）doing花时间做….，discover—discovering
【小题5】我们知道它富含世界需要的矿物质。Be rich in富含
【小题6】这里的“需求“是可数名词：need---needs
【小题7】我们也知道它含有大量人类需要的食物。plenty of大量的
【小题8】it’s是it is的缩写，-its是它的，指代“海洋的”
【小题9】正如它一直被叫的名字：用被动语态：has---has been
【小题10】我们还需要了解更多的关于海洋的事情。Many修饰可数名词，much修饰不可数名词