Premise:
"Poirot and I sat together, not being required to give evidence. "
Hypothesis: We wanted to testify, but were not called upon.

it is not possible to tell

Premise:
"Dole has taken this position because it is right for America, Dole spokeswoman Christina Martin said earlier this year."
Hypothesis: The position taken by Dole is right for America.

yes

Premise:
"yeah and all the trees and plants are coming out thank goodness and grass"
Hypothesis: All the trees and plants are coming out
yes