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

Two-thirds of the land ________ covered with green grass and the rest _______ covered with pine trees.

 I’ve spare ___ juice for you, and your half ____ in the refrigerator.

The number of people invited __________fifty, but a number of them__________ absent for different reasons. 

Our school had about 20 notebook computers but only one-forth_____used regularly. Now we have 50 working all day long.