We have spent _____money on English books .

Lawrence Craven, a doctor from the USA，is the author of several published reports, one of______ introduced the idea in 1953 ______aspirin could reduce the risk of heart attacks

________ your teacher __________ — She is friendly and helpful.

Only when the war was over return home.

Only when you ______ what you have learned to practice ______ say you have made it.