At that very moment my mind went completely _________ and I forgot what I was supposed to be doing.
| A．efficient | B．abundant | C．shallow | D．blank |
We made plans for a visit but _____ difficulties with the car prevented it.
| A．consequent | B．subordinate |
| C．substantial | D．subsequent |
The generation _____ makes it difficult for parents to understand their children's opinions.
| A．division | B．gap | C．separation | D．interval |
John _____ knowledge of radio just by staying around the radio station.
| A．caught on | B．worked up | C．took up | D．picked up |
With sufficient scientific information a manned trip to Mars should be _____.
| A．obtainable | B．potential | C．considerable | D．feasible |
At first the institute refused to purchase the telescope, but this decision was _____ revised.
| A．occasionally | B．consequently |
| C．successively | D．subsequently. |