I failed in the examination last week and I regret _____________ hard.
In order to _____ the rising production costs, the subscription rates have been increased.
Although Lucy was slimming, she found cream cakes quite _____.
Thomas Edison considered genius to be _____ one per cent inspiration and ninety-nine percent perspiration.
All foreign visitors are requested to _____ with the regulations in this area.
These continual _____ in temperature make it impossible to decide what to wear.