. Computer studies is Trong's favourite subject.

2. Mrs Hoa is our teacher of English./Mrs Hoa is our English teacher.

3. There are six coloured pencils in my friend's box.

4. Where does Ms Lan live?

5. Shall I introduce you to my best friend, An Son?

2 

Đáp án:

We also have some class rules, and we try to keep all of them. We always try to arrive at school on time.Besides, we remember books, school things, homework, etc.Moreover, we listen carefully in class . In addition, be prepared to work in pairs or in groups. Next, we do all the homework the teacher gives. And, we try to speak English in the English lesson. Last but not least, we also look over new lesson before going to school. 

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B=y^3-2×3y^2+3×2^4×y2^3

B=(y-2)^3

Tác dụng với kim loại 

PTHH: Fe + H2SO4$\to$FeSO4 + H2