___ from space, the earth with water ___70% of its surface looks like a "blue blanket".
He ____ have the ticket if I buy it .
This car looks like mine , yet it isn''t . Whose ____ .
The work ____ be finished in such a short time .
— You ought to have called her yesterday . — Yes , I know I ____ .
Why ____ you keep troubling your mother with such question while he is busy .