托福听力部分词汇替换(2)

　　B
　　backpack ——> knapsack
　　be crowded —— > be well-attended
　　be done —— > complete
　　be free —— > not busy
　　be in one ear and out the other —— > doesn't listen
　　be onto something —— > promising
　　be overwhelmed with —— > be busy with
　　beach —— > seashore
　　best score —— > perfect grade
　　beyond sb. —— > not understand
　　big sale —— > discount