1—Whatcolor_____ the cats—I think________white and black.

One of the customs officers, who was watching the arrivals very ______, saw feathers ______ from undera woman’s coat[ ]

Wang Pin is an advanced worker in our companyHe _______ for four years in Yangzhou University

The question is very difficult and of the students can answer it.

下列各句中，语言表达恰当得体的一项是（ ）