—I have learned that a large new building will be set up__________the Twin Towers once stood.—So have I.But the American people haven’t yet got over the shock of September 11.
He pretended _______ when his mother stepped into his room.
Johnny, you ______ play with the knife; you _____ hurt yourself.
Since 1949, the peoples living standard _______, causing a big _______ in population.
______ has already been pointed out, grammar is not a set of dead rules.
There is a mountain ________ the top is always covered with snow.