The bike needs _______, I am afraid.
—Did you stay up late last night?—Not very late. It was half past eleven I went to bed.
—When did accident happen?—Oh, it was on Sunday towards the end of this summer, as far as I can remember.
The project is so designed that once _______ nothing can be done to change it.
There was a man crying over there.He _______ himself.
______ a good result,the professor decided to do the experiment once more.