A. You need to work hard and never give up. B. You have to think carefully. C. You will make your invention work. D. You have to make a good plan and make sure that there is need for your invention. E. You must study hard. 1._____ 2._____ 3._____ 4._____ 5._____
( )Mary's school trip is May 5th. ( )Mary is very happy. ( )Mary is 14 years old. ( )We buy some apples and hamburgers. ( )They buy a new white hat for 4 yuan, and pants for 70 yuan.