We all need knowledge from the past — ______ it comes from personal experience or from studying history. It is our only guide to the future.
Nobody likes ___ in such an impolite manner.
---Whose coat is here? ---_____.
After reading the text, he ___ down some words in his notebook.
---Could you tell me ___ all of you think of your teacher? ---She’s a good teacher.
All ___ can be done has been done.