— You ought to have called her yesterday . — Yes , I know I ____ .
I saw no more than one copy left in the bookshop. Will you go and buy ______?
Does _______ matter if he can’t finish the job on time?
I don’t think _______ possible to master a foreign language without much memory work.
Therearetworoadsandeither ________tothestation.
Whenandwherethistookplace_________stillunknown.