问题描述：
用括号里的疑问词提问
Various products are on display at the fair.(what,where)
We send many letters and postcards every day.(who,what)
Wang Ping keeps his books in a cabinet.(who,what,where)
Our Export Fair takes place in Guangzhou twice a year.(what,where,how often)
There are four samples on the desk.(how many,what)
Various products are on display at the fair.(what,where)
We send many letters and postcards every day.(who,what)
Wang Ping keeps his books in a cabinet.(who,what,where)
Our Export Fair takes place in Guangzhou twice a year.(what,where,how often)
There are four samples on the desk.(how many,what)
问题解答：
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