`````英语语法问题`````part 2

`````英语语法问题`````part 2
【6】Celestial navigation,the ancient practice of using heavenly bodies to guide a ship’s course,（has becoming） a dying art since the advent of modern global positioning systems.
为什么是has become而不是has becoming?
【7】The artist’s repeated use of pale colors and amorphous forms,intended to imbue his paintings with a sense of ambiguity,only makes the paintings （look weakly）.
为什么是look weak 而不是weakly
look后面不是得副词么?
答案貌似是说这个weak是修饰前面的作品表现形式.
【8】Popping corn is possible because of the tiny amount of water （present） in dried kernels; when the kernels are heated,the water expands until it bursts the seams of the kernels.
为什么present不是presents,不用加s么?
【9】During the Triassic period,there was only one huge land mass,Pangaea,which encompassed all the present-day continents; some of the plants and trees （familiar to us ）today also grew on Pangaea.
familiar是动词么?familiar到底怎么用啊.
【10】They say comedians face a difficult task:they must challenge and mock the status quo without alienating their audiences who represent the status quo.
这句话哪里错了?