31. A large sum of money has been raised for the ____________ of the poorly-educated children in the mountainous districts.
It was very difficult to rescue the drowning boy in the sea. One moment the rescue workers _______him but the next moment they _____.
________confidence and the necessary equipmnt, they failed to rescue the 42 miners trapped in the coal mine.
—The plan _______for the trip is very important. —I see, and he is sure to work it out on time.
Can you explain ______ the OPEC can have such total control over the price of oil?
—Do you know the mission of the volunteers? —No. But I think _____ they will end up doing there will promote public awareness of environmental protection.