【評論主題】7 It’s been two weeks since the body was found, but the police have so far been unable to______ whot

【評論內容】ascertain 弄清，確定，查明v.demonstrate 顯示；表明v.investigate 調查，審查justify 為…辯護；證明…正當let alone 更不用說arrest 逮捕;拘捕so far 迄今；到目前為止

【評論主題】5 If you sign into this online portal, you may join multiple meetings______and do not have to worryt

【評論內容】collaboratively 合作地collectively 集體地；全體地concurrently 同時發生地successively 接連地；連續地portal 入口網頁；大門網站multiple 多個的participate 參加