I wanted to catch __________ early train, but couldn’t get __________ ride to the station.
Everyone was trying to ________ a better idea to persuade him to stay.
Use your head, _______you’ll work out the problem.
_______ is known to all, Lu Xun was famous as a great thinker.
I would appreciateback this afternoon.
If something ________, it becomes less and less and eventually disappears completely.