If it had not been for your help, I ____ the examination.

–Do you know where David is? I couldn’t find him anywhere. – Well. He _____ have gone far — his glasses are still here.

You _____ pay too much attention to your reading skill, as it is so important.

I can’t find the recorder in the room. It ________ by someone.

 If my father ______ here yesterday, he would have stopped me from going surfing.