It is vital that the work _______ in time.
A、isdoneB
这里主语从句中应该用虚拟语气，从句谓语用should+动词原形的形式，should可以省略。句意：及时完成这项工作是极其重要的。
That proposal is essentially irrelevant ________ the issue at hand.
________，he had no time to rest.
When_______,waterwillbeturnedintosteam.
During the past two decades, research has ________ our knowledge of daydreaming.
Although Tom is satisfied with his academic achievement，he wonders _______ will happen to his family life .
