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Solution:
A few works of reference are valuable as Encyclopedia, Britannica. In this context, "a few" is used to indicate a small number of something. It suggests that while there may not be many works of reference that are valuable, there are still some, such as the Encyclopedia Britannica. Therefore, "a few" is the correct choice to complete the sentence, accurately conveying the intended meaning.

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Solution:
During Diwali the shops are crowded with people. In this context, "crowded" indicates a large number of people present in the shops, suggesting that the shops are filled with customers or visitors. "Crowded" specifically conveys the idea of a space being densely packed with individuals. Therefore, "crowded" is the most appropriate choice to complete the sentence, accurately describing the situation during Diwali.