きのう テストが ありました。あまり （　　　）です。

Translation: Yesterday we had a test. It was not very difficult. - Grammatical points: Co-occurrence of 'あまり' with negative forms, and past tense agreement ('きのう' - yesterday). - Explanation: 1. The adverb 'あまり' requires a negative conjugation, meaning 'not very' (eliminating positive forms). 2. The timeline is established as past ('きのうテストがありました' - yesterday there was a test). This requires the past negative form: むずかしくなかった (was not difficult). - Adjective conjugation overview (むずかしい): - Present Positive: むずかしい - Present Negative: むずかしくない - Past Positive: むずかしかった - Past Negative: むずかしくなかった (Correct)