Khoảng cách từ vị trí đứng của người đó tới ngọn hải đăng là:

\(66: \tan(25^o) =129m\)

Đáp số: 129m

XI

1 has liked

2 have sold

3 have you been designing

4 has Nam seen

5 has broken

6 have you been doing

7 have been reading

8 have they offered

9 has only been teaching

10 has flown

11 have been playing

12 have seen

XII

1 have been looking - haven't found

2 have learnt 

3 have read

4 has been going - has bought

5 has been doing - hasn't finished

6 have you seen

XIII

1 have watched

2 Have you watched

3 has never run

4 has been running

5 has studied

6 has been studying

7 has cut 

8 has been cutting

9 have tidied 

10 has been tidying

11 has read 

12 have been reading

13 have spent 

14 have been spending

15 have been having

16 have had

17 have been talking

18 have talked

19 have gone out

20 have been going

17 C

18 B

19 D

20 B

21 A

23 B

24 A

25 B

26 B

27 B

28 B

29 C

30 B

31 A

32 B

33 D

34 A

35 A

41 B

42 C

43 D

44 A

45 A

6 C

7 D

8 C

9 B

1 characteristics

b) characteristically

2 description

b) discribed

3 activities

b) actively

4 appearance

b) disappeared

1 has been working

2 has had

3 has been surfing

4 have had

5 has been lifting

6 has been waiting

7 has passed

8 hasn't eaten

9 has won

10 has finished

II

1 have had

2 worked

3 has scored

4 Did you lock - went

5 has left

6 has changed - moved

7 have never met

III

1 moved

2 have known

3 haven't failed

4 broke

5 went

6 Have you finished

7 started

8 haven't gone

IV

1 had - has had

2 has broken - broke

3 has played - played

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