—Your colleague's spoken English is beautiful, Lily.—It's no wonder.She ____ in the USA for a year as a visiting professor.
_______ 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.