—I can’t always understand when people talk to me in English.

—Why not __________English more after class?

A．practice speaking

B．practice writing

C．to practice speaking

D．to practice writing

小明要到超市去买修正带，标价分别为3.5元，3元4角5分，4.0元．你能帮帮他吗？哪一种最便宜？