He pretended _______ when his mother stepped into his room.
A. to study B. studying
C. to have studied D. to be studying
Johnny, you ______ play with the knife; you _____ hurt yourself.
A. wont; cant B. mustn’t; may
C. shouldn’t; must D. cant; shouldn’t
Since 1949, the peoples living standard _______, causing a big _______ in population.
A. has been raised; rise B. has been rose; raise
C. has raised; rise D. has raised; rose
______ has already been pointed out, grammar is not a set of dead rules.
A. As B. It C. That D. Which
There is a mountain ________ the top is always covered with snow.
A. of that B. of which C. whose D. that
---Why did the police _____ the crowd?
---Because the presidents car ____ in the street.
A. break down, broke down B. break up, broke up
C. break down, broke up D. break up, broke down
