Itisvitalthatthework_______intime.
A、isdoneB
這里主語從句中應該用虛擬語氣，從句謂語用 should+動詞原形的形式， should 可以省略。句意：及時完成這項工作是極其重要的。
Anxietycan________withchildren’sperformanceatschool.
Iunderstoodfromherthatyouundertookotherimportantwork______.
Thisisthemostbeautifulvillage_______Ivisitedtheseyears.
Thegovernmentfinally________allthedocumentsrelatingtothewar.
Ayearlater，withthenation’seconomy________，Bush’sapprovalratingdroppedbelow40percent
