1. Một gen dài 0,255 micromet và có số nucleotit loại A chiếm 30 % tổng số nucleotit của gen.

a. Tính tổng số nuclêôtit của gen và số nucleotit mỗi loại.

b. Tính số số liên kết hidro và khối lượng của gen.

2. Cho biết một gen có số nuclêôtit G = 800 nuclêôtit chiếm 32% tổng số nuclêôtit của gen. Tính số nuclêôtit từng loại của gen và số liên kết hiđro giữa các nuclêôtit đó.

Nêu các sự việc, hiện tượng đáng khen hoặc đáng chê (ít nhất 4 sự việc) của người dân trong tình hình dịch bệnh Covid- 19 đang diễn ra hiện nay ở nước ta.

Cho (P): y=x² và (d): y= 2(m-1)x+5-2m. Tìm m để đường thẳng (d) luôn cắt (P) tại hai điểm có hoành độ là độ dài hai cạnh góc vuông của một tam giác có độ dài cạnh huyền bằng \(\sqrt{14}\)

Giúp em với ạ!

I. Put the verbs in the brackets in the correct form

1. After another lost game one of the journalists asked the coach if he (resign) ........... and the man replied that it (be) ......... out of the question

2. Don't brother (ask) ........... for his advice. He hardly ever (share) his opinions

3. Hadn't Alice better (stop) ........... (date) ............. the rough boy?

4. What (you/do) ........................, son? Your clothes are all in mud

5. Next Saturday, my parents (celebrate) ....................... their twentieth wedding anniversary

6. We told the men we (not be) ................. their enemies, but they ( not believe) ..................... us and (keep) .............. us at gunpoint until their boss arrived

7. The Ministry confirms that our reports (already/receive) ..................... by them

8. Mr Turner is the real pain. He (always/pick) .................. on us

9. Soon after the row, I realised I (can) ........... lose my best friend, so I decided ( apologise) ........... first and let bygones be bygones

10. Whenever I see them (kiss) .......... each other, I (feel) ....... jealous

11. Did anyone force you (hide) .......... the truth?

II. Put one correct word in each gap

1. Under no ............. are you allowed to get ......... touch with the enemy intelligence

2. Sarah can't ............ listening to ............... else's advice. She hates ........... ordered about

3. It is required that tax daclarations ............. be delivered ............... the end of the month

4. What was it ............... at the party last night? Oh, it was great. We all had a good .................. and enjoyed ............. a lot

5. Ann's not in. She's likely to ........... playing in the garden

6. Nobody knew .............. to look for you. You were .......... to be found yesterday

7. The doctor told me .............. off my shirt and my ves and then he inspected my chest ............. his stethoscope

8. Our daughter is allergic .......... pollen. In spring and summer, she suffers ...... terrible burning in her eyes and her throat

9. ........... I help you with this suitcase? Yes, please. It's .......... heavy for me ........... carry

10. The protesters must ............ been warned .......... advance because they were pretending to ........... doing nothing when the police forces arrived

11. ........... been rescued from the sinking ship, the refugees were taken ............... board of the American cruiser

III. Write in the suitable words to complete the following sentences

1. My baby suffered from a terrible stomachache and he vomited a few times at night. The doctor said he must have eaten something stale and got food _ _ _ _ o_ _ _ _

2. Strict safety _ _ a _ _ _ _ s were introduced before the Pope's visit. Policemen patrolled the streets day and night to eliminate any danger

3. Mr Doe is stone deaf. He will not hear anything you say without his hearing _i_

4. We're still in _e_ _ . We owe a lump sum of money to the bank

5. You only compliment and reward the workers from your department, but you keep forgetting about the other employees. How can you expect them to tolerate such grave _ _ _ u _ _ _ _ _?

6. In this mine, _ _ _ c _ _ _ _ stones like diamonds were extracted several centuries ago

7. George is really weird. He claims to have seen the extraterrestrial and spoken to them. He tends to make up such _ _ _ _ r _ _ _ _ _ _ stories quite often

8. We love hiking as a way of spending our _ _ i _ _ _ _ time at weekends

9. Unless you put more _ _ f _ _ _ in your work, you will never make any big progress.

I. Rewrite these sentences, using double comparatives with "the......,the......."

1. When he has a lot of free time, he feels relaxed

-> The ...................................., the.................................................

2. If you use a lot of electricity, your bill will be high

The ................................,the........................................

3. As I get older, I want to travel less

The .................................,the.............................

4. He talked a lot. I became bored

The.................................,the...............................

5. She drove fast. I became nervous

The ...............................,the.................................

6. He thought about his family. He became homesick.

The ................................,the.............................

II. Rewrite each sentence, beginning as shown, so that the meaning stays the same

1. It is easier for you to express anger than disgust?

Do you ............................... anger than disgust (find)

2. Jane was more attractive than Adam thought she would be

Adam had .................... less attractive (expected)

3. He had no idea she would be so pretty

She was much ............ she would be (than)

4. There aren't any trains earlier than this one

This is ...........................................

5. The bus takes longer than the train

The train ..........................................

6. I thought that learning to drive would be difficult, but it isn't

Learning to drive is .........................

7. I don't know as much Italian as Sue does

Sue knows ..........................

8. Bob is a much better swimmer than George

George can't ..........................

9. That's the best meal I've ever eaten

I've never ..............

10. Babara can skate just as well as John can

John isn't ..............................

11. Tom speaks more persuasively than Bill

Bill .......................................................

12. That's the worst film I've ever seen

I've never ...........................................

13. She knows a lot more about information technology than I do

I don't ..............................................

14. I thought this meal would cost more than it did

This meal didn't ...............................

15. I've never enjoyed myself so much.

I've never had ...................................

16. I thought this journey would last longer than it did

This journey didn't .................................

17. All other pubs are further away

This pub ...................................

18. Our house is older than all the other houses in the road

Our house is the ..........................

19. The market is less crowded than usual today

The market ............................

20. Home computers used to be much more expensive

Home computers aren't ..............................

21. Your car was cheaper than mine (cost)

...................................................................

22. Keith is slightly taller than Nigel (little)

...................................................................

23. I thought this film would be better (as)

.................................................

I. Sentence Rewriting

1. I hear the footsteps behind. I think someone is following us

I hear the footstep behind. I think we...............

2. The lawyer said I shouldn't say anything to the police

The lawyer advised..............

3. The test was long for me to finish (enough)

I.......................

4. During my visit to London, I took hundreds of photos (while)

I took hundreds of photos ...................... London

5. I can not afford to buy a train ticket (have)

I.....................

6. It is useless to worry about what has already happened (point)

There is .................

7. The exploration of the New World was made as early as the 15th century (explored)

The New World..............

8. Why are you interested in learning a new language ( want)

Why ............

9. Robert has not had a job for two years ( out)

Robert ............

10. Without his help we would all have died

If it ...........

11. Laurence hasn't seen his sister since she left for Japan

Laurence last .........

12. My younger brother finally managed to get a job

My younger brother was .......

13. You needn't finish the work today

There's .........

14. They find it easy to understand native speakers

They have no ..........

II. Use the cues to write into the passive voice

1. Careless drives cause a lot of road accidents

2. When did they offer you the job?

3. Jane is writing her new novel

4. The authority doesn't allow the villagers to swim in this lake

5. They are pulling down the old theater next to the park

6. Someone opened the door when he was away

7. Do people use this room for parties?

8. How often do you clean your car?

III. Verb forms and tenses

1. Julie had her house ....... (break) into when she ....... (visit) her parents in Japan

2. The money .......... (steal) .......... (not find) yet

3. This young man is said .......... ( own) a lot of houses

4. You will not know how delicious the food is until you ....... (finish) it.

I. Mistake Indentifying

1. Both of books have got the same number of pages

2. Could you show to me your book about the moon

3. Are you understanding what the lecture is saying?

4. You haven't to finish the work this afternoon: you can leave it later

5. There have many books on the table in the middle of the room

6. Mrs Van's daughter is absent today because her sickness

7. Is there somthing interesting at school this month?

8. The boy asks me where is the nearest bus stop

9. I'd like to buy for you a present

10. Is he getting married with a Japanese girl

11. He has the same height like his brother

12. Both Susan and Alice wants to spend their holiday in Rome