Chọn đáp án đúng:

1. The teacher ..... French and English. (know/ knows)

2. Of all the countries in that area of the world, perhaps Nigeria .... the most potential (have/ has)

3. Despite the bad weather we have had in the past days, there ..... no doubt that the tournament will go on. (is/ are)

4. Neither the student nor the teacher ..... about what happens on this trip. (care/ cares)

5. The large companies in our area .... cheap source of labor. (need/ needs)

6. Never .... the weather been so bad in the month of Junes and July. (has/ have)

7. Without the new taxes, houses built before World War II .... lower costs than more modern houses do. (have/ has)

8. According to the information on this page, items bought before 1940 ___ more than items made after that year. (is/ are)

9. Everyone selected to serve on this jury _____ to be willing to give up a lot of time. (have/ has)

10. Not only the students but also their instructor ..... been called to the principal's office. (have/has)

11. Most of the milk ..... gone bad. Six gallons of milk ..... still in the refrigerator. (has - are/ have - is)

12. Rice and beans, my favourite dish, ..... me of my native Puerto Rico. (remind/ reminds)

13. To an outside, the economics of this country ..... to be in disarray. (seem/ seems)

14. Of all her books, none .... sold as well as the first one. (have/ has)

15. The music that they listen to .... them to relax.

A. help B. are helping C. helps D. helping

Sửa lỗi sai

1. When he still worked for Oxfam, he was coming up with different ideas to help needy people.

2. The volunteers went to a nearby school on a Sunday morning, picked up a food package, and delivered them to an elderly person.

3. The lives of disadvantaged students are often very different for those of their more wealthy peers.

4. There are lots of amused ways to volunteer in the arts such as teaching, designing and assisting with a variety of arts and crafts.

5. Mahatma Gandhi fought against the rights of poor people and women in India and became a hero for millions of people.

6. In her lifetime, Audrey Hepburn also paid a visit to Viet Nam to bring awareness of immunisation and sets up clean water programmes.

7. While he and his wile Ali first went to Africa, they worked in a refugee camp for a month.

8. The famous Irish rock band U2 wrote the song Walk On to honour this amazed woman, who put her country before everything.

9. He worked in a big bank in London when suddenly he decided to leave this city to take part in Volunteer Bolivia.

Hỗn hợp X gồm C₂H₂ và C₃H₈ có tỉ khối so với H₂ là 15,25. Để đốt cháy hết 4,48l (đktc) hỗn hợp X thì thể tích O₂ (đktc) tối thiểu cần dùng là bao nhiêu?

Hỗn hợp khí A gồm có O₂ và O₃,tỉ khối của hỗn hợp khí A đối với hiđro là 19,2. Thành phần % theo khối lượng của O₃ là?