In the following passage, some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.

Psychologists ______ (1) ______ that human behaviour can and should be studied following the methods adopted by sciences like physics, chemistry, and biology. The key ______ (2) ______ of this view is that human behaviour is predictable, caused by internal and external forces, and can be observed, measured, and controlled. ______ (3) _____ order to achieve these goals, the discipline of psychology, for the larger part of the twentieth century, restricted itself to the study of _____ (4) _____ behaviour, i.e. the behaviour that could be observed and measured. It did not focus _____ (5) _____ personal feelings, experiences, meanings, etc.