bake (v)
烤

例句：
I baked the pie in my oven for 30 minutes.
我把这个派放在烤箱里烤了三十分钟。

Do you like baked chicken?
你喜欢吃烤鸡肉吗？

do sth.off the top of one's head
毫无准备地干什么事情，临时应付

例句：
I'll just have to give the speech off the top of my head. There's no time to write it down.
没有时间写讲稿，我只好即席发言。

He is not here right now.
他现在不在。

也可以说成：
He is not in at the moment.
He is not available now.