—Who’s that at the door?—          is the milkman.

This is such a letter ____came last night．

— Would you lend me ________ paper to write ________ paper?　　　　— Sorry, I haven’t any.

．No one knows exactly when our ancestors started talking，but new evidence suggests  _______might have happened a long time ago．

I hope there are enough glasses for each guest to have___________.