25. Mike _______ have known the solutions to this problem, or he would have told us.

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That couldn’t be better. Congratulations! Are you kidding? Terrific!

If I would have known it If I had have known it Had I known it Should I known it

mustn’t, must may not, might couldn’t, can needn’t, need

That’s very regretful. That’s pitiful. That’s too bad. That’s a pity.

mustn’t shouldn’t can’t needn’t

did man know man had known man knew had man known

what they have known about    what have they known about
   when they have known about    when have they known about

should have known would have known could have known must have known

If I would have known If I had have known Had I known Should I know

That couldn’t be better! Congratulations! You can’t be serious! Terrific!

That's very regretful. That's pitiful. That's too bad. That's a pity.

Does；has Does；have Do；has Do；have

will have will be is going to have are going to have

might have passed should have passed would have passed could have passed

have ; known; have known did; know; knew did; know; have known have; known; knew

If I would have known it If I had have known it Had I known it should I know it