After ________ dinner, Stephanie likes to play ________ guitar for a while in the garden. A. a; a B. 不填; the C. the; a D; 不填;不填
We made plans for a visit but _____ difficulties with the car prevented it.
The generation _____ makes it difficult for parents to understand their children's opinions.
John _____ knowledge of radio just by staying around the radio station.
With sufficient scientific information a manned trip to Mars should be _____.
At first the institute refused to purchase the telescope, but this decision was _____ revised.