- So:

Nam didn't feel well, so he stayed at home.

- Because:

Because Nam didn't feel well, he stayed at home.

- Although:

Exercise 2: Choose the word whose main stressed syllable is placed differently from that of the other in each group.

6. A. participant B. environment C. experience D. competition

D âm 3, còn lại âm một.

12. A. historic B. delighted C. annual D. annoying

C âm 1, còn lại âm 2

13. A. conclusion B. tradition C. attraction D. evidence

D âm 1, còn lại âm 2 

14. A. sightseeing B. stadium C. souvenir D. history

C âm 3, còn lại âm 1 

15. A. relax B. famous C. photo D. postcard

A âm 2, còn lại âm 1

1. It took Peter two weeks to visit Hanoi.

2. You should consider having a tour guide when you travel somewhere.

3. You need to speak English well if you want to study abroad.

4. Although I felt sick yesterday, I went to school.

5. The film was so boring that I fell asleep while watching it.

                                   Giải:

Diện tích nước Nga là:

\(0,44\cdot39\text{ }000\text{ }000=440\text{ }000\cdot39=17\text{ }160\text{ }000\left(km^2\right)\)

Vậy diện tích nước Nga là \(17\text{ }160\text{ }000\text{ }km^2\)

Tính:

A = 1/2 - 1/2² + 1/2³ - 1/2⁴ + ... + 1/2⁹⁹ - 1/2¹⁰⁰