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