B
    book ——> reserve
    boring ——> uninteresting
    borrow —— > lend
    breathe —— > air pollution
    brighten one's spirits —— > make one feel better
    broke —— > no money
    budget —— > money // price
    bump into —— > meet // see
    buy —— > purchased
    by and by —— > in a short while
    by leaps and bounds —— > quickly