We must ______ the importance of the four modernizations.A.learn by heart B.keep in mind C.remember by heart D.know by heart 选哪个?为什么?

反义疑问句习题We must save the Earth.We must save the Earth,______,_______? 英语翻译We must have ______ food and the food must ______ clean and be _______ _______ . He ______ there before I rang him(get)Older people must __ to politely (speak)At the ______ of the class,we had a test(begin) we must ______(eat) in the dining hall. Must we ______(be) on time next time.求助 急. we must help ______ poor Must i finish the exercise this afternoon?Yes,you ______ 在图书管我们必须保持安静We must ______ ______ _______ in the library 改成特殊疑问句We must (follow the rules around us).______ ________ we do? 反义疑问句：We must hurry,or we can't catch the train,______后面是什么 We must take care of the books in the library.The books in the library ______ ________ ________ ________ ______. we must call the We must purify the We must keep the noise under 50dB（分贝） here.The noise must ______ ______under50dB here We must wait for the green lights at all the ______(cross). I think we ______ go to buy something for dinner,There ___ little food left in the fridgeA,needn't;isB,must;are.C,shall;haven'tD,must;is 在教室我们需要保持安静 We must _____ ______ in the classes We must make the roads ______.A.bad B.safe c.danger 补全句子 If we own a ______ and healthy body ,I think we must study _____ and _____ .