We must ________ every chance we have to improve our communicating ability.
The advanced worker, _________to devote himself to the factory, has succeeded in developing new techniques of production.
I can hardly imagine peter ____ across the Atlantic Ocean (大西洋)in five days.
Many students insist that the choice of their courses and universities ______ their own interest.
I simply couldn’t understand how it _____ that you did so much work within such a short time.
—Could I speak to Miss Smith, please?—______. She’s gone to the post office.