Generally speaking,the limits of a person’s intelligence are fixed at birth,but whether or not he reaches those limits will ________ his environment.
Whatever he does, once he set up a goal, he would start pursuing it without _________.
—— Would you mind if I asked you where you’re from?—— _______________.
Historically, ________ main material for making tables has been wood, but ________ metal and stone have also been used.
__________ has recently been done to provide more buses for the people, a shortage of public vehicle remains a serious problem.
Because Sarah has always saved __________, she is now able to afford a big house.