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Complete the following passage by writing the correct form of the words given in brackets. Write your answers into the box below.
RAIN MAKING
When it rains, it does not always pour. During a typical storm, a (41. COMPARE) _______ small amount of the lock-up moisture in each cloud reaches the ground as rain. So the idea that human intervention - a rain dance, perhaps - might encourage the sky to give up a little (42. ADD) _______ water has been around since prehistoric times. More recently, would-be rain makers have used a more direct procedure - that of throwing (43. VARY) _______ chemicals out of aero-planes in an effort to wring more rain from the clouds, a practice known as "cloud seeding".
Yet such techniques, which were first developed in the 1940s, are (44. NOTORIETY) _______ difficult to evaluate. It is hard to (45. CERTAIN) _______, for example, how much rain would have fallen anyway. So, despite much anecdotal evidence of the advantages of cloud seeding, which has led to its adoption in more than 40 countries around the world, as far as scientists are concerned, results are still (46. CONCLUSIVE) _______. That could be about to change. For the past three years (47. RESEARCH) _______ have been carrying out the most extensive and (48. RIGOUR) _______ evaluation to date of a revolutionary new technique that will substantially boost the volume of (49. RAIN) _______.
The preliminary (50. FIND) _______ of their experiments indicate that solid evidence of the technique's effectiveness is now within the scientists' grasp.
RAIN MAKING
When it rains, it does not always pour. During a typical storm, a (41. COMPARE) _______ small amount of the lock-up moisture in each cloud reaches the ground as rain. So the idea that human intervention - a rain dance, perhaps - might encourage the sky to give up a little (42. ADD) _______ water has been around since prehistoric times. More recently, would-be rain makers have used a more direct procedure - that of throwing (43. VARY) _______ chemicals out of aero-planes in an effort to wring more rain from the clouds, a practice known as "cloud seeding".
Yet such techniques, which were first developed in the 1940s, are (44. NOTORIETY) _______ difficult to evaluate. It is hard to (45. CERTAIN) _______, for example, how much rain would have fallen anyway. So, despite much anecdotal evidence of the advantages of cloud seeding, which has led to its adoption in more than 40 countries around the world, as far as scientists are concerned, results are still (46. CONCLUSIVE) _______. That could be about to change. For the past three years (47. RESEARCH) _______ have been carrying out the most extensive and (48. RIGOUR) _______ evaluation to date of a revolutionary new technique that will substantially boost the volume of (49. RAIN) _______.
The preliminary (50. FIND) _______ of their experiments indicate that solid evidence of the technique's effectiveness is now within the scientists' grasp.
