11. He changed his address constantly ……… elude the police.

13. There is ……………..Chalk to write with.

14. I fought for my country and………………… my father before me.

15. I don’t know………………..he will come back

16. Caring a table……………very tired

17. What time …………?

18. “Why was the road closed yesterday?”
There …………….. a bad accident.

19. His plays are so difficult to understand that even the critics find difficulty ……….them

Passage1 Questions 20-28 are related to a Passage1 with blank spaces. Choose the one choice which best completes the passage. Sometimes you might feel that if you had a perfect memory, all your problems with learning would be solved. You would be able to (20) ………… through exams without much revision. You would never again face the (21) ….. of forgetting someone’s name. But imagine for a moment, not forgetting anything-not even last year’s shopping (22) …. You would be (23) ………. with information. Memory covers a wide range of actions and needs. What we know about the grain is far from complete, so philosophers and scientists find it difficult to be (24) …………. about the nature of the memory. Remembering and forgetting can be understood in many different (25) ……….. but broadly, three distinct classes of memory have been established: personal, cognitive, and habit memory. Personal memories are those acts of remembering which refer specially to each person’s life history. If you say “I remember the first time I traveled by train”, you will probably have an image in your mind of the (26) ………. and be able to describe things in it. Cognitive memory helps us learn, for example, a speech or a (27) ……….. of music. Habit memory (28) ……….. those abilities needed to perform actions such as typing or driving. All these actions must be learned but once they have been, you will rarely remember anything consciously as you perform them.

Passage 2:

Because of its accuracy in outlining the Earth’s subsurface, the seismic-reflection method remains the most important tool in the search for petroleum reserves. In field practice, a subsurface is mapped by arranging a series of wave-train sources, such as small dynamite explosions, in a grid pattern. As each source is activated, it generates a wave train that moves downward at a speed determined uniquely by the rock’s elastic characteristics. As rock interfaces are crossed, the elastic characteristics encountered generally change abruptly, which causes part of the energy to be reflected back to the surface, where it is recorded by seismic instruments. The seismic records must be processed to correct for positional differences between the source and the receiver, for unrelated wave train, and for multiple reflections from the rock interfaces. Then the data acquired at each of the specific source locations are combined to generate a physical profile of the subsurface, which can eventually be used to select targets for drilling.

30. The speed with which the wave train travels……

• a) has nothing to do with the reflection
• b) is recorded to process the similarities between surface and subsurface
• c) is completely based on the characteristics of the rock
• d) depends on the wave train sources