_______(safe)needstobeimprovedontherailwaysinthatcountry
safety
暫無解析
Ifyouhadbeeninbetterhealth,we___(allow)youtojointheminthework.
不用說，我們現在已不是生活在傳統時期。翻譯
Studentsshould（）theirowninterestsaswellasdotheirschoolwork.
TheUnitedStatesisacountry_(advance)inscienceandtechnology
Thetheoryofblackholesinspace__(accept)bymanyseriousscientistsandastronomers.
