Our English teacher is good at telling funny jokes. Okay？ at)___。

Answer: Our? English? Teacher? Is it? Okay？ Where is it? Tell? Funny joke. This is an objective fact. In the simple present tense, the subject is our English teacher's singular, so we choose the be verb in be (meaning good at …), at is a preposition, followed by a gerund phrase to tell funny jokes as the object, and tell jokes means to tell jokes. So the answer is that our English teacher is good at telling funny jokes.