45. Choose the right adjective gold or golden. In some cases both will do.

The adjective 'golden' is typically used to describe something made of gold or having the color of gold. The adjective 'gold' can also be used as an adjective, often referring to the color or material. In the context of the provided examples, 'golden' is more appropriate for descriptive phrases like 'golden light', 'golden hair', and 'golden watch'. 'Gold' might be used in contexts like 'gold ring' or 'gold chain' when referring to the material. However, 'golden' can often be used interchangeably for color. Given the options and common usage, 'golden' is generally preferred for descriptive qualities, while 'gold' is more specific to the material or a direct color reference. The phrase 'golden light' is a common collocation. 'Golden hair' and 'golden watch' are also standard. For 'ring' and 'chain', 'gold' is more common when referring to the material. For 'corn', 'autumn', 'threads', 'cross', and 'crown', 'golden' is more likely to be used descriptively (e.g., golden corn, golden autumn, golden threads, golden cross, golden crown). Therefore, 'golden' is the more versatile and frequently applicable adjective in these contexts, especially for descriptive purposes.