_______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.
I have battled with my _______ whether I should keep the extra money given to me or return it to the seller.
— It’s difficult to buy a ticket online because of the 1 billion clicks daily.—_____________. There can be errors for every single step.
We haven’t reached any agreement in the discussion ______ neither side would give way to the other.
The worst thing about the do-it-yourself game is ______ sometimes even men live under the delusion(错觉) ______ they can do anything, even when they have repeatedly been proved wrong.
Whatever sport you take up, you can make it greener by using environment-friendly equipment and ___ products ______ from recycled materials.