Jack is a great talker.   It’s high time that he              something instead of just talking.

The thief ________ in from the kitchen window as the door was closed.

—Is the letter from your mother?—Yes. But she ________ the letter herself, because she doesn't even know one word.

But for your timely warning, we ___have been unaware of the danger. Thank you very much! 

I commanded that he      at once.