3.Josh graduated with his master’s degree in space studies and planetary sciences, but after years of working odd jobs and barely ( ) , he decided to go back to get his teaching license.

　　A. breaking new ground

　　B. making ends meet

　　C. putting on the back burner

　　D. proving his mettle

　　【答案】B。句意为：Josh毕业于太空研究和行星科学硕士学位，但经过多年的打零工和勉强维持生计后，他决定回去获得他的教学许可证。A.开创新局面;B.入不敷出;C.搁置;D.证明他的毅力。所以答案选B。