31.F
32.should your family reduce the amount of electricity
33.You must remember to turn off the fan when you leave the classroom
34.my family are going to the beach for two weeks this summer
35.Mary's mother is an engineer and works in a big factory
36.He does not own that Rolls Royce
37.How often do your grandparents come to visit you?
38.Sunday Linda is a taking part in this compeition ( chưa được chắc lắm mong bạn thông cảm ^^)
39.There are forty classroom in nam's school
40.How much money do they pay you for a month working here?
