Did you ever have someone’s name on the tip of your tongue(在嘴边) and yet you were unable to recall it？__1__ this happens again，do not __2__ to remember it. Do something __3__ for a couple of minutes，__4__ the name may come into your head. The name is there，since you have met __5__ person and learned his name. It __6__ has to be dug out. The first effort to recall __7__ the mind for operation，but it is the subconscious (下意识的)__8__ that go to work to dig up a __9__ memory. Forcing yourself to remember __10__ never helps because it doesn’t __11__ your memory；It only tightens it. Students find the preparatory method helpful __12__ examinations. They read over the questions __13__ trying to answer any of them. __14__ they answer first the one __15__ which they are most confident (自信). Meanwhile，deeper mental activities in the subconscious mind are taking __16__；work is being done on the __17__ difficult question. By the time the easier questions are answered，answers __18__ the more difficult ones will usually begin to __19__ into your mind. It is often __20__ question of waiting for memory to come to your mind. 1. A． As B． WhenC． While D． Whether2. A． try B． wantC． hesitate D． wait3. A． simple B． apartC． else D． similar4. A． unless B． andC． or D． until5. A． some B． certainC． a D． this6. A． then B． reallyC． only D． indeed7. A． leads B． beginsC． helps D． prepares8. A． deeds B． activitiesC． movements D． ways9. A． light B． freshC． unclear D． dark10. A． always B． almostC． only D． hardly11. A． loosen B． weakenC． strengthen D． reduce12. A． into B． inC． about D． by13. A． after B． besidesC． before D． against14. A． Thus B． ButC． Therefore D． Then15. A． of B． withC． for D． in16. A． place B． shapeC． charge D． action17. A． too B． lessC． not D． more18. A． to B． ofC． about D． for19. A． appear B． growC． extend D． come20. A． nearly B． likelyC． just D． even