Zhong Nanshan is a medical expert ____________ saves lives and is always honest.
which
who
what
whose
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---What do you think of Tom? ---He is ________ honest boy. He can play ________ piano very well.
It has been sunny these days, so I ______ it ______ tomorrow.
----______has Tom been a doctor ? -----Since two years ago.
Mr Hu has travelled to six countries _______.