He ignored the neighbor's request that ________ less noise at night.

I wish that you ________ such a bad headache because I’m sure that you would have enjoyed the concert.

Had your father seen the doctor earlier, he ____.

 Food safety has become a growing concern. Had the offenders been punished severely enough, the situation________ different now.

---- Did you visit the Big Ben in London?---- No, we ______ it, but we spent too much time shopping.