His “Selected Stories”＿＿＿＿＿first published in 1990．

I took mathematics and physics because I think that ________ very important for me to make further research in this field.

 There        a desk and some chairs in my room. The desk is very nice.

The words that we should pay attention to_______on the blackboard.

--  _________ you from Australia?   --No, I’m from Singapore.