Judging from what has happened here, it’s high time that we _______effective measures to prevent this.

This computer is of good quality. If it ___________ break down within the first year, we would repair it at our expense.

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

I can't thank you _______ much because without your help I _______ have won the first prize.

 I’d rather you ___ anything about it for the time being.