7. Someone [knock] ..is knocking.............. at the door. Can you answer it?

8. Minh usually [do] ..does.......... his homework in the evening.

9. Our school [be] ... is........ surrounded by mountains.

10. I [like] ...like......... maths but i [not like] ...don't like....... English.

11. Would you like ....to drink..... [drink] some water?

12. She needs ......to .work................. [work] harder.

13. They like ....going.................... [go] out.

14 ........are................... there any milk in the fridge?

15. We .........aren't............... [not work] now.

Tính giá trị biểu thức 

a) 20360 - 4005 : a x b với a = 5 ,b = 2

=20360 - 801 x 2

= 20360 - 1602

= 18758

b) a x 12 + b x 12 + c x 12 với a = 25 , b = 12 , c = 63

 = ( 25+12+63)x12

= 110 x12

=1320

1. gave>/        2. was        3. doesn't have

4. will arrive       5. will arrived        6. will be

7. had graduated        8. had moved       9. consist

10. will be  11. got       12. was

13. call      14. get           15. was

16. are            17. arived      18. couldn't        19. felt.