Câu 2 .Viết các công thức cấu tạo có thể có của các chất hữu cơ có công thức phân tử sau: C₃H₆ , C₂H­₆O, C₄H_{10 ,} C₃H₇Cl

Hãy nêu phương pháp hoá học để nhận biết sự có mặt của ba khí CH₄ ; C₂H₂ và khí CO₂ đựng trong ba lọ khác nhau. Viết PTPƯ xảy ra.

Combine two sentences into a new one using the given words in brackets. Do not change the given words in any ways.

1. The new restaurant looks good. However, it seems to have few customers. (Although)

=> ………………………………………………………………………………………

2. The coffee was very strong. He couldn’t drink it. (so)

=> …………………………………………………………………………………………..

3. I did not see Susan off at the airport. I feel bad about it now. (wish)

=> ……………………………………………………………………………………………

4. The book is very interesting. My brother bought it yesterday. (which)

=> ............................................................................................................................................

5. The man wanted to get some fresh air in the room. He opened the window. (order) =>...........................................................................................................................................

6. The footballer has been banned from playing again. He took drugs. (who) =>...........................................................................................................................................

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

Package holidays, covering a two weeks' stay in an attractive location are increasingly popular, because they offer an inclusive price with few extras. Once you get to the airport, it is up to the tour operator to see that you get safely to your destination. Excursions, local entertainment, swimming, sunbathing, skiing - you name it - it's all laid on for you. There is, in fact, no reason for you to bother anything yourselves. You make friends and have a good time, but there is very little chance that you will really get to know the local people. This is even less likely on a coach tour, when you spend almost your entire time travelling. Of course, there are carefully scheduled stops for you to visit historic buildings and monuments, but you will probably be allowed only a brief stay over night in some famous city, with a polite reminder to be up and breakfasted early in time for the coach next morning. You may visit the beautiful, the historic, the ancient, but time is always at your elbow. There is also the added disadvantage of being obliged to spend your holiday with a group of people you have never met before, may not like and have no reasonable excuse for getting away from. As against this, it can be argued that for many people, particularly the lonely or elderly, the feeling of belonging to a group, although for a short period on holiday, is an added bonus. They can sit safely back in their seat and watch the world go by.

1. When you go on a package holiday, you don't have to _____________.

A. arrange anything yourself                          B. pay for any extra activities

C. follow the tour schedules                                       D. travel in an organised group

2. People going on package holidays ______________.

A. are unable to amuse themselves                

B. expect to be amused by tour operators

C. find most of their interests catered for

D. are able to make friends with lots of local people

3. Which of the following statements is NOT true?

A. You are constantly on the move when you are on a coach tour.

B. A coach tour is always exhausting.

C. You don't get enough sleep on a coach tour.

D.You get no chance to visit historic buildings in famous cities on a coach tour.

4. "Time is always at your elbow". This means ______________.

A. you can take your time visiting a place

B. you have to spend a lot of time visiting a place

C. your time is always limited when visiting a place

D. there is always no time for you to visit any place

5. In spite of its disadvantages, spending a holiday with a group is good particularly for _____________.

A. schoolboys and schoolgirls

B. the lonely or elderly people

C. newly married young couples

D. those who always travel by themselves

1. They last went on holiday many years ago.

=> They haven’t…………………………………………………………………………

2. They will appoint a new managing director next week.

=> A new managing director…………………………………………………

3. It is vital that you attend the meeting.

=> You have……………………………………………………………………………

4.  “I’ll call you as soon as I arrive at the airport,” he said to me.

=> He promised.......………………………………………… …………….

5. It’s two months since we last saw a movie.

=> We haven’t ..................................................................................................

6. “Did you eat chocolates?” Maria said to Peter.

=>Maria asked ......................................................................................................................