only by practising a few hours every day 空格 inprove your English. could you; will you 选 哪个?

only by practising a few hours every day 空格 inprove your English. could you; will you 选 哪个?
only by practising a few hours every day 空格 inprove your English. could you; will you 选 哪个?

only by practising a few hours every day 空格 inprove your English. could you; will you 选 哪个?
will you ,直接用将来时就对了
或者can you
could 用在委婉的请求上