1) Researchers have predicted that there is a possible relationship between the two phenomena. a) hypothesised b) proved c) speculated d) suggested 2) Only clinical trials can show whether or not the drug is truly effective. a) ascertain b) contradict c) demonstrate d) determine 3) This significant discovery contributes more to our knowledge than any past study. a) advance b) breakthrough c) development d) drawback 4) Only when we get the funding to do the research, can we begin to recruit our team. a) carry out b) conduct c) experiment d) undertake 5) It was observed that the introduction of the compound started an explosive chemical reaction. a) caused b) affected c) set off d) triggered 6) The unexpected result of the experiment may disprove earlier theories. a) conclusion b) finding c) outcome d) prediction

Exercise 1.6 on page 260

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