3/10+3/11+3/12+3/13+3/14>3/15+3/15+3/15+3/15+3/15=15/15=1

mặt khác: 3/10+3/11+3/12+3/13+3/14<3/10+3/10+3/10+3/10+3/10=15/10<20/10=2

                             Vậy:   1<S<2

là số 97

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4. Underline the correct item

1 I Watched / was watching a DVD when my cat jumped / was Jumping on me .

2 She was buying / bought a new dress last month .

3 Greg was sleeping / slept while Joanne listened / was listening to her Mp3 player .

4 Mum cooked /was cooking dinner when someone knocked / was knocking on the door .

5 Sue was watering / watered the flowers when it started / start to rain .\

6 They were walking / walked to school last Monday because there was no bus

7 I ate / was eating a sandwich while my parents drank / were drinking coffee .

chắc là con...lợn

never never never never never never never never never never never never 

ko biết thì hỏi
muốn giỏi phải hok