Now it\'s at it\'s Best意思是什么?

Now let's try it什么意思 it's的意思是什么 It's the subject that I am best at. Look at the ____!It's ____ heavily now. It's time ()supper now it's lapooh right now It's all over now. it‘s raining right now Now let‘s try it! it's now or never It's raining [ heavy] now It's a quarter____ten now.