Choose the correct modal constructions.

Choose the correct option.

Nobody knows what happened to Lenny. I think it [will be|might have been|should have been] a road accident.

Troy [should have studied|studied|must study] harder before the test. Now he has to retake it.

My mum's excited! She [should have passed|must have passed|can't have passed] her Spanish exam.

I didn't know about this movie! Ted [might have told|couldn't have told|should have told] me about it!

Joe [can't have been|must have been|should have been] in Spain last weekend. I saw him at the swimming pool!

Kelly [needn't have helped|must have helped|should have helped] me; I dealt with it on my own.