—Have you ____ joined in a dragon boat race?—Yes,I have.
You should keep the window _________ because the room is so hot and damp.
If you don’t know the word, you can _________ in the dictionary.
It is not ______ that everyone will be able to be famous persons.
They ________ often _______to be careful before _______the road.
He up very late in the morning ,but now he up very early.