An observation can be keen.Logical formLearned from426 sentences. Persons can be keen.Logical formLearned from394 sentences. An eyesight can be keen.Logical formLearned from385 sentences. A female can be keen.Logical formLearned from384 sentences. An appreciation can be keen.Logical formLearned from378 sentences. Intelligence can be keen.Logical formLearned from368 sentences. A sportsman can be keen.Logical formLearned from355 sentences. Competition can be keen.Logical formLearned from339 sentences. An ear can be keen.Logical formLearned from319 sentences. A student can be keen.Logical formLearned from280 sentences. An ability can be keen.Logical formLearned from279 sentences. Insights can be keen.Logical formLearned from272 sentences. Observers can be keen.Logical formLearned from235 sentences. Observations can be keen.Logical formLearned from217 sentences. A gardener can be keen.Logical formLearned from190 sentences.