46.The loss of biodiversity has a serious _______ on the survival of wildlife and humans.

                                               A. affect                        B. problem                    C. impact      D. influential

47.Global warming can _______ the ecological balance, bringing about terrible consequences.

                                               A. destroy                     B. upset                         C. converse  D. injure

48.Gavin _______ the idea of dividing the rooms in half.

                                               A. came up with            B. work out                   C. used up    D. run out

49.We have to allow _______ the possibility that we might not finish on schedule.

                                               A. to                              B. at                              C. for           D. on

50.Fourteen manufacturers were included _______ the primary development of the new aircraft.

                                               A. for                            B. in                              C. at  D. about

Chọn một đáp án trong số A, B, C hoặc D điền vào mỗi chỗ trống để hoàn thành đoạn văn sau.

Coronavirus disease 2019 (COVID-19), which causes serious (36)............ illness such as pneumonia and lung failure, was first reported in Wuhan, the capital of Hubei, China. The etiological agent of COVID-19 has been confirmed as a novel coronavirus, now known as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), (37) ................ is most likely originated from zoonotic coronaviruses, (38).............. SARS-CoV, which emerged in 2002. Within a few months of the first report, SARS-CoV-2 had spread across China and worldwide, reaching a pandemic level. As COVID-19 has (39).............. enormous human casualties and serious economic loss posing global threat, an understanding of the ongoing situation and the development of strategies to contain the virus's spread are urgently needed. Currently, various diagnostic kits to test for COVID-19 are available and several repurposing therapeutics for COVID-19 have shown to be clinically effective.(40) ......... , global institutions and companies have begun to develop vaccines for the prevention of COVID-19. Here, we review the current status of epidemiology, diagnosis, treatment, and vaccine development for COVID-19.

Question 1. A. respiratory B. epidemic C. isolated D. infectious

Question 2. A. where B. which C. that D. whose

Question 3. A. like B. the C. with D. as

Question 4. A. spread B. made C. cause D. triggered

Question 5. A. Therefore B. However C .In addition D. Since

Scientists want to study if there is life on Mars. This means creating a spacecraft that will travel to Mars to study the planet. How will this affect the economy in Florida?

A. The program will change how businesses present themselves to the public.

B. The program will create new buildings which will take up more of the land.

C. The program will create thousands of jobs, create an increase in tourism, and promote education.

D. The program will improve the quality of health for people living in Florida.

kèm giải thích nx nhé

Many people worry that fossil fuels, _____(23)____coal and gas, will run out. However, scientists predict that, very soon, the Earth’s biggest problem will be water, not fuel. If global warming _____(24)____it will have serious consequences for millions of people. For example, sea levels will rise and it won’t be possible to stay _____(25)____many towns and villages. Unless people move to higher ground their homes will flood. In other places, due _____(26)____rising temperatures and modern farming, the land is getting drier. Large areas will become desert if we don’t look _____(27)____the land better. It isn’t too late! Things will improve if we all take action. What will you do to improve the situation?

Question 23:
 A. without      
B. like                               
C. such                              
D. as

Question 24: 
A. continues   
B. puts out                     
   C. pollutes                     
   D. stops

Question 25: 
A. in                
B. over                           
   C. on                               
  D. for

Question 26: 
A. in                
B. to                                
  C. for                             
   D. at

Question 27: 
A. after           
B. for                               
 C. down                           
 D. into

1. The cases of COVID 19 outside China have increased 13 fold,________?

     A. hasn’t they                B. haven’t they              C. will they                   D. don’t they

2. What you have said is wrong,_________?

     A. isn’t it                       B. haven’t you              C. is it                            D. have you

3. COVID 19 can be characterized as a pandemic, ________?

     A. can it                        B. can’t it                      C. isn’t it                       D. can’t they

4. The coronavirus had already overwhelmed China, South Korea, Iran and Italy,________?

     A. hadn’t it                    B. hasn’t it                     C. didn’t it                     D. wasn’t it

5. Health authorities have activated their most serious response level,________?

     A. haven’t it                  B. hadn’t they               C. have it                       D. haven’t they

6. Your mother is cooking in the kitchen,_________?

     A. isn’t she                    B. doesn’t she               C. won’t she                  D. is she

7. Chinese officials quickly shut down Wuhan market,_________?

     A. doesn’t it                  B. didn’t they                C. hadn’t they               D. do they

8. There are no easy ways to succeed,________?

     A. are there                   B. aren’t there               C. aren’t they                D. are they

9. No one is a better cook than my sister, ________?

     A. aren’t they                B. is he                          C. are they                     D. is it

10. They’ll buy a new apartment, ________?

     A. will they                   B. won’t they                C. don’t they                 D. will not they

1. The cases of COVID 19 outside China have increased 13 fold,________?

     A. hasn’t they               B. haven’t they             C. will they                   D. don’t they

2. What you have said is wrong,_________?

     A. isn’t it                       B. haven’t you              C. is it                           D. have you

3. COVID 19 can be characterized as a pandemic, ________?

     A. can it                        B. can’t it                      C. isn’t it                       D. can’t they

4. The coronavirus had already overwhelmed China, South Korea, Iran and Italy,________?

     A. hadn’t it                   B. hasn’t it                    C. didn’t it                    D. wasn’t it

5. Health authorities have activated their most serious response level,________?

     A. haven’t it                  B. hadn’t they               C. have it                      D. haven’t they

6. Your mother is cooking in the kitchen,_________?

     A. isn’t she                    B. doesn’t she               C. won’t she                  D. is she

7. Chinese officials quickly shut down Wuhan market,_________?

     A. doesn’t it                  B. didn’t they               C. hadn’t they               D. do they

8. There are no easy ways to succeed,________?

     A. are there                   B. aren’t there               C. aren’t they                D. are they

9. No one is a better cook than my sister, ________?

     A. aren’t they                B. is he                          C. are they                    D. is it

10. They’ll buy a new apartment, ________?

     A. will they                   B. won’t they                C. don’t they                 D. will not they

11. This house is not safe, ________?

     A. isn’t this                   B. isn’t it                       C. is it                           D. is this

12. Ba rarely goes out at night, ________?

     A. doesn’t he                B. is he                          C. isn’t he                     D. does he

13. Everybody looks tired, ________?

     A. doesn’t it                  B. don’t they                 C. does it                       D. do they

14. I’m a bad man, ________?

     A. am not I                   B. isn’t I                        C. aren’t I                     D. am I

15. I think she is a dentist, ________?

     A. don’t I                      B. isn’t she                    C. do I                           D. is she

16. I don’t think you are an engineer, ________?

     A. do I                          B. aren’t you                 C. are you                     D. don’t I

17. Let’s turn off the lights before going out, ________?

     A. shall we                    B. will you                    C. shan’t we                  D. won’t you

18. Don’t be late, ________?

     A. are you                     B. shall we                    C. do you                      D. will you

19. Someone wants a drink, ________?

     A. doesn’t it                  B. don’t they                 C. do they                     D. doesn’t he

20. Nobody phoned, ________?

     A. do they                     B. didn’t they               C. will she                     D. did they

21. You had turned off the lights before you went out, ________?

     A. had you                    B. hadn’t you                C. did you                     D. didn't you

22. He's American, ________?

     A. won't he                   B. didn’t he                   C. doesn't he                 D. isn’t he

23. Everything is fine, ________?

     A. aren’t they                B. isn’t it                       C. are they                    D. is it

24. I wish to study English, __________________?

     A. don’t I                      B. do I                           C. may I                        D. mayn’t I

25. What a nice dress, ________?

     A. is it                           B. isn’t it                       C. doesn’t it                  D. does it

26. One can be one’s master, ________?

     A. can’t you                  B. can’t one                  C. can she                     D. A&B

27. You’d better stay at home, ________?

     A. hadn’t you                B. had you                    C. don’t you                  D. do you

28. You’d rather learn English, ________?

     A. hadn’t you                B. would you                C. had you                    D. wouldn’t you

29. You don’t believe Peter can do it, ________?

     A. do you                      B. can’t he                    C. can he                       D. don’t you

30. These are 3 oranges you bought yesterday, ________?

            A. aren’t they  B. are they       C. are these     D. aren’t these