- ______ do you  like best? (   )

- Spring.

It's yellow. It goes “ Quack …quack”

—He ____(go) to his factory. He ____(make) a lot of signs with his friends there.

—Which sign ____ he ____(make)?

—They all ____(make) the same signs: No ____(park). There are always a lot of cars around our house.

宋朝的海外贸易超过前代，成为当时世界上从事海外贸易的重要国家。中国商船的踪迹，近至朝鲜、日本，远达阿拉伯半岛和非洲东海岸。政府为了加强管理，在主要港口设立的管理机构是（    ）