题目

选词填空never, usually, hardly, sometimes, always（1）She always finishes her homework on time. She leaves it for tomorrow.（2）My English teacher speaks too fast. We canknow what she is talking about.（3）Students have no lessons on weekends.（4）I usually g to school on foot, but I take the bus.（5）Tom never gave up (放弃). He was trying out new ideas. 答案：【1】never【2】hardly【3】usually【4】sometimes【5】always已知x=-1是关于x的方程2x2+ax-a2=0的一个根，则a=________，另一根为________．