请教大家几道语法

yanhuangbabyUID: 178305

1。the purpose ( of )   traveler's checks ( is ) to  protect travelers from  (theft ) and accidental  ( lost ) of money

为什么是d， 该怎么改呢？

2。 the early ( periods of  aviation ) in US was marked by ( exhibition flights )
made by ( individual  fliers ) or by ( teams of performers ) at country fairs.

为什么选a呢？该怎么改？

3。the american anarchist Emma Goldman infused her spirited lectures,
( publishes ),and demonstrations  ( with a ) passionate ( belief ) in the freedom of  (the) individual .

why  a  ?

4. while studying the  ( chemistry ) ( of human body ) ,Dr.Rosa won a Nobel Prize for the research she ( conducted ) on the  (role of ) hormons .

why  b ? how to correct ?

alanch555UID: 156273

1. losing
2. period
3. publications
4. the human body

yanhuangbabyUID: 178305

谢谢楼上t友
那么请问第1道呢？
有高手知道吗？

avexUID: 159089

lost - loss
periods -period
publishes - publications
human body - the human body