【正文】 l, but he ________ not. Sometimes he works extra hours.A．can B．must C．need D．may33．—Must we stop the Japanese government discharging nuclear waste water (排放核污水) into the Pacific Ocean?—________. Because everyone should protect our earth and it is bad ________ us to eat the polluted seafood and drink the waste water.A．Yes, we can。 should C．should。t20．We shouldn’t throw any objects from the building. Even a small object ________ cause serious injuries or death, when dropped from a great height.A．must B．should C．may D．need21．When people are waiting at the zebra crossing, cars and buses ________ wait and let them go first.A．must B．may C．can D．need22．According to the rule, used batteries ________ be dropped in the red bin for harmful wastes.A．may B．would C．should D．might23．— Listen! Tom ________ be listening to the music while doing his homework.— Let’s go upstairs to remind him to turn it off.A．should B．could C．would D．must24．—Must I finish all my homework today, Mum?—No, you ________, my dear. You can finish some tomorrow if you like.A．needn’t B．shouldn’t C．can’t D．mustn’t25．Never throw objects from the building. Even a small object ________ cause serious injuries, or death, when dropped from a great height.A．must B．should C．may D．need26．— Mum, why do I have to wash hands so many times a day?—You ________ be too careful, for your health.A．can’t B．mustn’t C．may not D．needn’t27．—Will Jim e to Yangzhou for a holiday?—He ________e and it depends on how much homework he will have.A．may B．should C．must D．need28．—In China, many parents plain that their children have to stay up late to do the homework. —Don’t worry. The government has realized the problem. I’m sure there ________ be good news soon.A．can B．should C．need D．must29．We teenagers ________ have dreams. With dreams and hard work, anything amazing ________ be created.A．may。t C．shouldn39。 dares climbD．dare to say。 dares to climbB．dare to say。t D．mustn39。t B．can39。 to mend10．You ________ write the report again because spelling mistakes are not allowed at all.A．must B．can C．may D．could11．—________ I see your ID card? We have to check your personal information. —Sure. Here you are.A．May B．Need C．Should D．Must12．— Mom, must I clean my room now?— No, you ________. You can do it after dinner.A．needn’t B．mustn’t C．shouldn’t D．can’t13．If you buy your mum an iRobot floor cleaner, she ________ sweep the floor every day.A．can’t B．mustn’t C．needn’t D．shouldn’t14．—Have you decided to take up teaching as career after graduation? —I ________ go abroad for further education instead. But it depends.A．must B．should C．may D．sh