【正文】 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．shall21．—Mum, I bought some strawberries on my way home.—Oh, you’re so sweet. But the strawberries ________ be put into the fridge for freshness.A．must B．can C．may D．need22．— 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．must23．—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’t24．—Suzy described every detail of the accident just now.—Her memory ________ be pletely back.A．shall B．need C．must D．could25．—Is it usually warm in Yancheng in May??—Yes. But it _______ be rather cold sometimes.A．must B．should C．would D．can26．—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。 of B．No, we mustn’t。 of C．Yes, we must。 for D．No, we needn’t。 for27．Look at the floor, Tom! ________ you watch TV while having a meal?A．Should B．Could C．Must D．May28．— Excuse me. I haven’t finished reading the book yet. May I keep it a bit longer?— Sorry, you ________. You must return it on time.A．needn’t B．can’t C．won’t D．shouldn’t29．—Will my car be ready by the end of the day?—It ________ be, sir. I’ll call if there’s any problem.A．must B．could C．shall D．should30．For the safety of the passengers, objects like guns ________ be carried on board.A．may not B．needn’t C．might not D．mustn’t31．According to the rule, used batteries ________ be dropped in the red bin for harmful wastes.A．may B．would C．should D．might32．—Who’s the man over there? Is that Mr. Black? —It ________ be him. Mr. Black is much taller than that man.A．may B．must C．can’t D．mustn’t33．You ________ drive after drinking alcohol(酒). It’s against the law.A．mustn’t B．needn’t C．couldn’t D．wouldn’t34．We teenagers ________ have dreams. With dreams and hard work, anything amazing ________ be created.A．may。 can B．might。 should C．should。 can D．must。 has to35．You ________ be careful with the camera. It costs!A．can B．will C．should D．may36．—Who’s singing next door? Is it Miss Wang?—It ________ be her. She’s having the board meeting.A．can’t B．shouldn’t C．mustn’t D．needn’t37．It’s of great importance to protect the environment. Each of us ________ take an active part in it.A．can B．may C．would D．should38．To avoid ________, w