请教几个语法问题

zhangyan0516UID: 2150259

1、 In the Unitated States, the attorney genral is a  cabinet in charge with the
daministration of the Department of Justice.
本题是将with改成of吗？可我怎么觉得attorney前不应有the。


2、  An accomplished saxophonist and composer ,John Coltrane begun his career
playing in the big bands of the early 1950's.
本题答案是begun错了，我不知道应怎么改，而且我觉得 career playing 应改成
playing career，意为“演绎生涯”，请帮忙解释一下，是不是我意思理解有错误？


3、   Areas of fertile soil called deltas , usually --------,are formed by mud deposited
at the mouth of a river.
本题选的是triangular in shape ,请问triangular shape为什么不对？


4、  Stars derive their energy from thermonuclear reactions that take place in
their heat interiors.
本题答案是their错了，我有些想不通，它应该代的是stars吧，为什么不可以？该怎么改呢？

zhangyan0516UID: 2150259

怎么没人理我啊？：（