我們英語老師善於講有趣的笑話．（be?good?at）___．

答案：Our English teacher is good at telling interesting jokes． 說的是客觀事實用壹般現在時，主語是our English teacher單數，故be good at（表示擅長…）中的be動詞選擇is，at是介詞，後加動名詞短語telling interesting jokes做賓語，tell jokes表示講笑話，故答案是Our English teacher is good at telling interesting jokes．