_____ wants to study well must learn things _____.
242. We have got everything ready and all of us are waiting for you. You should have _____ quickly for the trip to Guangzhou.
241. I am leaving in an hour but I haven’t _____ my clothes into my trunk.
240. It is an important problem. You should ________ before you draw a conclusion.
239. He_____ me 50 yuan and didn’t return it to me until last night.
238. --- Ought he to get down to his work at once? --- Yes, he _____. ought B. ought to C. must D. should to