Though some foreign scientists had a ______ opinion of his new invention, his fellow workers never thought ____ of it

The reason ________they were fired was ____they were not honest

I can’t say which wine is best—it’sa_______of personal taste.

Seventy percent of the students _____ taken part in the work and seventy percent of the work _____been finished. [ ]

下面句子中加点成语使用恰当的一项是（ ）