to suppose (argue / assert / assume / claim)
To assume (To believe)
to have a particular opinion about or attitude towards something (estimate / assert / hold / feel)
To feel
to say that something is true or is a fact (argue / assert / assume / claim)
To claim
to have an idea or opinion (estimate / assert / hold / feel)
To hold an opinion
to say what you believe the cost, size, value, etc. of something is (estimate / assert / hold / feel)
To estimate
to present reasons for or against a thing (argue / assert / assume / believe / claim)
To argue /'ɑr guiyou/