I ______________ have passed my examination easily，but I made too many stupid mistakes．

Since nobody gave him any help, he    have done the research on his own.

 My demand is that the information referred to in my report ________ to Mr. Brown without delay. 

—Why didn’t you help him? —I __________, but I didn’t have the money. 

Though the whole world ______ against me, I would do what I consider as right.