For given questions, read the text below and decide which answer (A, B, C or D) best fits each gap.

LISTEN TO SEE.
For some time scientists have known that the brain 1) ....... out non-essential data A. drains B. filters C. runs D. strains in order to 2) ........... information from a plethora of stimuli. A. process B. manufacture C. develop D. manage Now new evidence is appearing from research 3) ........... at the University of California, San Diego, A. taken up B. carried out C. handed over D. looked up that 4) ......... to a more intimate connection between the senses of hearing and sight than was formerly thought. A. indicates B. shows C. points D. leads It seems that what people see is 5) ........... influenced by what they hear, the research suggesting that an object is seen more clearly when preceded by a sound. A. greatly B. extremely C. mostly D. abundantly In a(n) 6) ............. reported in the science journal 'Nature', A. research B. survey C. experiment D. investigation thirty-three 7) ........ were asked to indicate A. constituents B. civilians C. conscripts D. volunteers when a 8) ............. light appeared immediately after they had heard a sound. A. weak B. faint C. dull D. low The light and sound were 9) .......... either on the same side or on different sides of them, A. performed B. displayed C. presented D. shown and the light was more 10) ......... identified when it came from the same side as the sound. A. rightly B. accurately C. genuinely D. really Hearing a sudden sound, therefore, appears to enhance our capacity to perceive visual stimuli located in the same place. During the test, the subjects' brain 11) ......... to the light and sound were recorded too, A. pulses B. replies C. waves D. responses to discover whether focusing on the sound affects the visual areas of the brain. Although still in its 12) ........ stages, A. premature B. first C. early D. developing the San Diego research may be able to shed light on mental illness.