You had better ______some time every day for sports so that you can keep yourself energetic.
In today’s fast changing and competitive world, to be able to learn faster and more effectively is not merely desirable; it is ________.
—What a pity! Their experiment is a failure. —They ________ better under more favorable conditions.
—Life is hard these days. —At least we have some money left. That's ________, isn't it?
Having a glass of water first thing in the morning helps rid your body of poisonous substances that ________ overnight.
Square dancing ________ to help maintain fitness has caused conflicts between the Damas and the neighboring residents.