He showed interest in the plan.
He expatiated on his plan.
He contemplated their plan.
he argued articulately for his plan
His plan went well after all.
He went ahead with the project
He showed much enthusiasm for our plan.
He carried out the scheme faithfully.
He carried out the plan.
He decided to get on with the plan.
He explained the main purpose of the plan.
We understand that he is for the plan.
He gave his consent to the plan.