13. We have chatted on the phone since it began to rain.

14.We have known each other since we were at university.

15.She hasn't phoned her parents for 3 weeks.

16.We haven't been to this restaurant for a long time.

17.How long have you had the laptop?

18.I haven't joined such an exciting party before.

20.The last time I heard from her was many years ago.

21.The last time the children were taken to the park was in 2012.

22.This is not our first visit to this city.

23.I have seen this movie twice.

24.He has been to a tennis match twice.

25.She has done the housework since she got home.

45.C

46.A

47.D

48.D

49.B

50.C

51.D

52.A

53.B

54.B

Hemiacetal là một nhóm chức năng trong hóa học hữu cơ hình thành khi một phân tử aldehyde hoặc ketone phản ứng với một phân tử alcohol. Cụ thể, hemiacetal được tạo ra thông qua phản ứng cộng nucleophilic, khi nhóm hydroxyl (-OH) của alcohol tấn công nhóm carbonyl (C=O) của aldehyde hoặc ketone.

1. => The sports club offers swimming lessons, football training and practice, badminton
2. => Besides these activities, it provides students martial arts, BMX biking, dancing or yoga
3. => It helps students to participate in performing on stage, working on lights, sound and special effects. Some excellent students can go on to take part in community theater when they become adults
4. => School clubs help them to build skills in different areas
5. => Children who like playing on computers or tablets may take part in STEM programmes
6. => Science clubs can offer robotics, coding and video game development
7. => You can choose your favorite club based on your age, your interests and your strengths
8. => By following school clubs, a student can expand their social circle, develop new skills, and have better skills to solve problems

program ToanDienSo;

var n, i, j, count: integer;

A: array[1..1000] of longint;

isPrime(x: longint): boolean;

var i: longint;

begin

if x < 2 then

begin

isPrime := false;

exit;

end;

for i := 2 to trunc(sqrt(x)) do

if x mod i = 0 then

begin

isPrime := false;

exit;

end;

isPrime := true;

end;

 isToanDienSo(x: longint): boolean;

var temp, i: longint;

multiplier: longint;

begin

if not isPrime(x) then

begin

isToanDienSo := false;

exit;

end;

 temp := x;

while temp > 0 do

begin

if not isPrime(temp) then

begin

isToanDienSo := false;

exit;

end;

temp := temp div 10;

end;

multiplier := 10;

for i := 0 to 9 do

begin

if not isPrime(x * multiplier + i) then

begin

isToanDienSo := false;

exit;

end;

end;

isToanDienSo := true;

end;

begin

 readln(n);

 for i := 1 to n do

read(A[i]);

 count := 0;

for i := 1 to n do i

f isToanDienSo(A[i]) then

count := count + 1;

writeln(count);

end.

1.C

2.B

1.began

2.was leaving

3.discovered

4.tend

5.will be leaving

6.developed

7.studied

8.accepted

9.returned

10.was

11.realized

12.made

13.had only included

1. What Is Data Science? Data science is the art and science of extracting valuable insights and knowledge from large and complex datasets. It combines elements of mathematics, statistics, computer science, and domain expertise to solve real-world problems. As organizations increasingly rely on data-driven decision-making, data scientists play a crucial role in transforming raw data into actionable insights.

2. Skills Needed for a Data Science Career: To excel in data science, you’ll need a mix of technical and soft skills:

3. Benefits of a Data Science Career:

III.

1. of

2.clean

3.for

4.before

5.which

6.members

7. wrapped

8.visit

? Question

1.=>One or two days before the festival,

2.=>On New Year morning, the young members of the family pay their respects to the elders. And the children receive lucky money wrapped in red tiny envelopes. Then people go to visit the neighbors, friends and relatives

V.

1.B

2.A

3.D

4.B

5.C

6.D