Which is the longest bridge ______the Changjiang River , do you know ?A through B across C on D over
_______ 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.
It’s the first time ______ he has helped us.
Here are two pairs of shoes, ______ you may choose.