Choose the best alternative to fill in the gaps in each

Choose the best alternative to fill in the gaps in each of the following sentences. 1 I39;ve ... some research on sea animals. a) мейд b) done c) prepared d) ended 2 The theory will be ... by computer simulation. a) мейд b) helped c) tested d) experimented 3 It39;s difficult to ... animals39; unexplained powers and obtain reliable results, a) experiment b) look for c) search d) investigate 4 Scientists found no ... for the existence of life on other planets, a) ways b) evidence c) facts d) signs 5 A good understanding of mathematics is sufficient to explain a wide variety of natural.... a) events b) causes c) effects d) phenomena 6 Unfortunately, the investigation did not run as smoothly as had been .... a) done b) worked out c) anticipated d) decided 7 Pets sometimes ... to know what we are thinking about, a) seem b) look c) think d) feel 8 There have been some ... on unusual animals behaviour, a) evidence b) reports c) stories d) articles