A là hiđrocacbon mạch hở, trong phân tử có 1 liên kết ba. Khi cho 4 gam tác dụng với dung dịch brom dư thấy lượng brom đã tham gia phản ứng là 32 gam. Hãy xác định công thức phân tử của A.

Read the following passage and mark the letter A, B, C or D on your sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 36 to 46

I was with Overseas Volunteers (OV) for a year after leaving university, and I was sent to an isolated village in Chad, about 500 kilometres from the capital N’Djamena. Coming from a (36)______country, I got quite a shock, as conditions were much harder than I had ( 37) ______. But after a few days I soon got used to (38) ______there. The people were very friendly and helpful, and I soon began to appreciate how beautiful the countryside was.

One of my job was to supply the village with water. The well was a long walk (39) _____, and the women used to spend a long time every day ( 40)_______heavy pots backwards and forwards. So I contacted the organization and arranged to (41 ) _____some pipes delivered. We built a simple pipeline and a pump, and it worked first time. It wasn’t perfect there were a few (42) _____but it made a great difference to the villagers, (43 )______had never had running water before. And not (44 ) ____did we have running water, but in the evenings it was hot, because the pipe had been (45) ____ in the sun all day.

All in all, I think my time with OV was a good experience. I would recommend it to anyone who was planning to work for a charity

Điền vào ô 43

A which

B. that

C. they

D. who

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

He showed himself a good student. He proved himself a good athlete.

A. Not only he showed himself a good student but he also proved himself a good athlete.

B. He did not show himself a good student but he proved himself a good athlete.

C. A good student not only showed him but he also proved himself a good athlete.

D. Not only did he show himself a good student but he also proved himself a good athlete.

Cho các chất sau: dd Fe(NO₃)₂, dd HCl, dd KMnO₄, dd Cl₂, dd NaBr, dd AgNO₃. Cho các chất phản ứng với nhau từng đôi một, số trường hợp xảy ra phản ứng là:

A. 10

B. 9

C. 7

D. 8