One of my classmates accidentally ____ he had cheated in the last examination, or he wouldn’t have got so high a mark.

Thanks for your directions to the house; we wouldn’t have found it ___.

It’s reported that scientists have ________ an effective way to deal with H1N1.–Really? That’s great!

下列各句中，表达得体的一句是（ ）

However, the southern part of Ireland was unwilling and ______ to form its own government.[ ]