Swimmers must be very strong in order to build up speed because of the high resistance of the water. Runners, ____, must struggle against the heavy resistance of the air and ground.
I'd like to take _____ of this opportunity to thank you all for your cooperation.
I could tell he was surprised from the _____ on his face.
We had a marvelous holiday: only the last two days were slightly _____ by the weather.
The book seems to have been _____ from various books and articles.
As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.