His writing is so confusing that it's difficult to make out ________ it is he is trying to express.(2011·安徽)
A．that B．how C．who D．what
The shocking news made me realize ________ terrible problems we would face.(2011·北京)
A．what B．how C．that D．why
As many as five courses are provided，and you are free to choose ________ suits you best.(2012·陕西)
A．whatever B．whichever C．whenever D．wherever
________ wants to stay in a hotel has to pay their own way.
A．Anyone B．The one C．Whoever D．Who
It was never clear ________ the man hadn't reported the accident sooner.(2011·江苏)
A．that B．how C．when D．why
(2012·天津)It doesn't matter ________ you turn right or left at the crossing—both roads lead to the park.
A．whether B．how C．if D．when
