The employees were asked to concentrate their attention________improving the quality of the products.[ ]

What color is your coat— It’s orange. It’s orange coat.

下列各句中没有语病的一句是（ ）

When asked about their opinions about the schoolmaster, many teachers would prefer to see him step aside ________ younger men.(2011·湖北，30)

Where were you when I called you yesterday evening–I_________dinner with my friends in a restaurant.