The doctors are ________ about the guidelines under which they can carry out euthanasia.
A、atastretchB
本题考查的是短语区分。A.不休息地，连续地;B.不知所措，茫然，不了解;C.任意的，随便的;D.最后，终于。句意：医生们不了解执行安乐死的准则。
We are all concerned _______ her safety.
WethankyouforyourletterofMay5th,____yourpurchasefromusof5000tonsGreenBeans.
Thepolicemancameuptothelonelyhousewiththedoor_______,_______thereforawhileandthenenteredit.
In1985,_______becamethefirstinternationalhotelcompanytoopenahotelinChinabearingitsownname.
Importswillbeallowedinproportion_______exports.
