Exercise1 :chuyen cac danh tu sau sang danh tu so nhieu .
1 .a book 11 . an armchair 21 .family 31.a room 41.a potato
2 .a pen 12.a board 22 .a doctor 32 a cat 42 .a bus
3 .a class 13. a lamp 23 . a city 33. a cat 43.a basket
4 a classroom 14 .a student 24 .a leaf 34.a chair 44.a foot
5 .a country 15 .a table 25.a wife 35.a sheep 45.a tooth
6 .a key 16 .a desk 26.a bamboo 36.a man 46.a nurse
7 .a box 17 .a couch 27.a stereo 37.a kilo 47.a bench
8 .a pencil 18 .a window 28 .a bag 38.a ox 48.a cow
9 .an earser 19 .a person 29.a telephone 39.a clock 49.a half
10 .a day 20 .a door 30.a bookshelf 40.a tomato 50.a cup
Exercise 2:Nhin cac tu o bai 1 va sap xep cach doc xuoi s,es vao cac cot sau sao cho phu hop :
/s\ /iz\ /z\
this exercise is so easy