Exercise 1:

1. ______we lived in town, we often went to the theater.

a. after b. when c. for d. or

2. He took the food eagerly, _______he had eaten nothing since dawn.

a. if b. in case c. but d. for

3. ________the sun rose, the fog dispersed.

a. as b. when c. before d. after

4. _______a married man, he has to think of his family.

a. if b. as c. or d. so

5. Tired_______he was, he offered to carry her.

a. as b. though c. although d. however

6. Some people waste food_______others don't have enough.

a. as b. in case c. while d. before

7. _______she came to know him better, she relied on him more.

a. while b. because of c. though d. as

8. _______I sympathize with you point of view, I can't accept it.

a. while b. although c. but d. a or b

9. How can you expect your childen to be truthful________you yourself tell lies?

a. when b. therefore c. because d. since

10. Strong______he was, he couldn't lift it.

a. like b. as c. or d. and

11. He stole, not_______he wanted the money, _______because he like stealing.

a. for/but b. because/but c. although/however d.because/and

12. Not everybody thinks the building is ugly________, some people say it looks marvelous.

a. on the contrary b. because c. although d. since

13. Business has been very bad this year_______, we have had to close one of our factories.

a. consequently b. as a result c. but d. a or b

14. Take a map with you_______you lose your way

a. if b. in case c. so that d. so

15. The play was very boring, _______they walked out

a. so b. if c. when d. while

17 h cho nha

ong 90

me 44

bo 45

anh 25

em 20

1000*95/100=950

hihj

Gọi số chính phương đó là n. (n \(\in\) N*)

Ta có: n = x² (x \(\in\) N*) và x²(x² - 1) 

<=> x⁴ - 1 chia hết cho 12

=> đpcm

3/7 + x = 1 + 1/5

3/7 + x = 5/5 + 1/5

3/7 + x = 6/5

x = 6/5 - 3/7

x = 27/35

Số đội viên sau khi chuyển phải chia hết cho 3 

Vậy ta có số đội viên phải là 1 trong 3 số sau: 42 ; 45 ; 48

Ta lần lượt truy xét thi chỉ có 48 la có thể là số đội viên

ta có :

đội a :14+8=22 (bạn)

đội b :28:2 =14 (bạn)

đội c:12(bạn)

Phòng thứ ba vì sư tử chết hết rồi .