1. all of our merchandise are(->is) completely guaranteed. all이 복수인데 왜 is 가 맞나요?? 2.regarding to라는 표현이 잘못된건가요?? regarding 은 전치사죠? to 붙히면 틀리나요? 3.because repairs to and maintenance of existing equipment ...에서 because 랑 and 랑 접속사인데 repairs to 가 왜 맞는 지요?? 4.the shareholders were less than completely .............with the takeover~~ (contents,content,contentment,are content) 답 content 인데 형용사content래요..왜그런지요??전치사 with 앞에는 명사 아닌가요? 5. .....we know about certain diseases is still not sufficient to prevent them from spreading easily among the population. (why,that,what,which) 답을 모르겠어요 6. a sharp drop in earings from petroleum products has led to nagative domestic growth~~ 에서 has led to 가 틀렸다는데 왜죠?