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1 , in -> on
2 , Do -> Does
3 , tower -> towers
4 , city -> cities
5 , is -> are
6 , more busy -> busier
7 , big -> bigger
8 , do -> does
9 , at -> in
10 , because -> so
Exercise 2 . Underline one mistake in each sentence and correct it.
1. I live on the twenty-one floor of City Tower.
=> in
2. Do your brother live in a small house?
=> Does
3. There are two high tower near my house.
=> towers
4. Ha noi is one of the most beautiful city in Viet Nam.
=> cities
5. These cities is large and busy.
=> are
6. Living in a big city is more busy than living in the countryside.
=> busier
7. This building is big than that one.
=> bigger
8. What do your hometown ? – it is beautiful.
=> does
9. My best friend, Lisa s living at the mountains.
=> in
10. It is a nice and big city, because I want to live there.
=> so
\(NTK_X=16\cdot8,5=136dvC\)
Vậy không có số nguyên tố X thỏa mãn