các đường thẳng Ax,By,Cz song song với nhau như hình vẽ:

a) Các góc A₁ ,C₁ có bằng nhau ko ? Vì sao?

b) tính C₁ +CAx

c) tính C₂ +CBy

d) tính CAx + CBy +ACB 

e) nếu AB\(\perp\) By thì AB có vuông góc với Ax và Cz ko ? Vì sao ?
 

1: ...... quickly they ran , they just couldn't catch up with the van

A: however      B: so          C: even           D: much

2: the plan still went ahead ............ the various problems in the early stage 

A: although    B: because  C: because of  D: despite

3: "you should stop working too hard ....... you'll get sick"

A: or else    B: if   C: in case   D: whereas

4: you may get malaria .......... you are bitten by a mosquito 

A: if      B: so that    C: though    D: unless

5: she got the job ..... the fact that she had very little experince

A: although   B:because of      C: despite    D: because

6: i studied English for four years in high school . ......, i had trouble talking with people when i was traveling in the US

A: therefore   B: otherwise   C:although  D:however

7: she was able to finish university ...... her financial difficulties

A: although    B: because   C: despite   D: because of

8: .... your precious help , i wouldn't have certainly overcome most of the pratical difficulties

A: if not       B: provied     C: unless   D: without 

9: Jane's been unfaithful to Jim threes times , but he still loves her ..... everything

A: apart    B: in spite     C: in addition to      D: because of

10: in Britain , most shops close at 6 pm , ...... in other countries they often open in the evening , too

A: despite    B: moreover    C: neverthless    D: whereas

11: parents shouldn't use physical punishment ... it negatively influences chidren's development

A: because of    B: although   C: because  D: in spite of

12: children are encouraged to read books ...... they are a wonderful source of knowledge

A: because of    B: in spite of   C: because   D: although

13: he achieved great success in his musical career ... his hearing disablity

A: despite   B: although    C: because   D: because of

14: ...... busy she is , she manges to pick her children up after school every day

A: however   B: although    C: despite   D: because

15: a newborn baby can neither walk nor crawl . a newborn tiger , .... can run with in minutes of birthday

A: therefore   B: even though   C: otherwise  D: however

23: although he is strong , i'm not afraid of him 

--- in spite of 

24: i can sleep although it is hot 

--- in spite of

25: he always studies hard though he encouters difficults 

--- despite 

26: although it got dark , they continued to work

--- in spite of 

27: although he's got an Englush name , he is in fact German

--- despite

28: we bought the house though its rooms were small

--- we bought the house despite

29: although he had planded everything carefully , a lot of things went wrong

--- despite

30: although th prices are high , my daughters insist on the movie 

--- despite

31: although they study hard , they can't get good marks

--- in spite of

14: even though it was cold , i went swimming

---in spite of

15 : these students didn't arrive late although there was the trafic jam 

--- despite 

16: she didn't get ill though she worked very hard

--- in spite of 

17 : though he had much experience , he didn't succeed in repairing te machine 

--- despite 

18: though Kid has failed so often , he has never beendisappointed

--- despite

19:though i hadn't eaten anything for 24 hours , i didn't feel hungry 

--- in spite of 

20 : he ate all the fruits though they were green

--- he ate all the fruits despite

21: although he hadn't finished the paper , he went to sleep

--- despite 

22: although the steets are narrow , maany people drive cars in the this city 

---- in spite of 

8: because there were the obstacles , the building didn't go along as planed

--- because of 

9: although she was ill , she went to scchool 

--- in spite of 

10: she didn't eat much though she was hungry 

---- in spite of 

11: i accepted the job although the salary was low

---- despite

12: he didn't leave school even though his family was poor

---- despite 

13:the flight was not delayed though it was foggy 

---- despite

help me : 

1: Mary can't sleep because there was the noise 

---- because of

2: his wife usually gives him a list because he often forgets things

--- because of

3: he left school because his life was hard 

---- because of

4: because he got up early , he wasn't late for first train

---because of

5: Nick is often punished because he is lazy 

---- because of 

6: Karen works on Sundays because she gets paid extra

--- because of

7: we didn't go fishing because the water was rough 

---- because of 

HELP ME :  we couldn't study because it was noisy 

---because of ......