Only by shouting at the top of his voice ____________.
____ is no doubt ____ Jennifer will come to see me this weekend as usual.
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.