Making great efforts to struggle hard in your study,if ______,will possibly lead to your great success in the college entrance exam next year.
(2012·江苏) —Thank God you're safe! —I stepped back, just __________ to avoid the racing car.
He hasn't slept at all for three days. __________ he is tired out.
Good technique in medicine means less pain and fewer deaths and, __________ it is our duty to masterit.
I can lend you my textbook __________ you must return it to me before class.
Although a teenager, Fred could resist __________ what to do and what not to do.