Đặt hai điện tích điểm q1 = -q2 = 4.10-8 C tại A,B trong không khí cách nhau 6 cm. Xác định lực điện tác dụng lên q3 = 4.10-8 C đặt tại C trong hai trường hợp:

a) CA = 4 cm, CB = 2 cm

b) CA = 4 cm, CB = 10 cm.

Give the correct form of the given words to complete the following
sentences.

6. Our campaign for.....................eradication was started in 2000 ( literate)
7. She.............................her father as she was growing up (idol)
8. Were women.......................allowed to vote before 1945? (office)
9. Nowadays more and more people ...................take care of others
(volunteer)
10. My brother and his friends spend hours a week helping ......or
handicapped children in the city (advantage)
11. It’s a ........................to see Jordan again after such a long time (please)
12. I’d like to express my great...................to your company for a donation
of one million dong (grateful)
13. You need to be more............if you want to become a novelist (imagine )
14. We consider it an ..........job to help people in our home village (honour)
15. The....................................are helped to overcome difficulties by the
volunteers (able)
16. What about a small gift to Mary after her....................?(present)
17. The...........of our group scored 20 points at the last question (represent)
18. The teacher gave a clear..........of the rules of the competition (explain)
19. My most..............experience happened a few years ago (embarrass)
20. Has any............been made about the English competition? (announce)
21. We must limit population.........................because of our limited
resources (grow)
22. We must raise an ...................of the problems of overpopulation (aware)
23. You should give..................................proof to support your ideas
(science)
24. . The number of literate females fell.........................between 1998 and
2004 (drama)
25. .There are more than 50..........................................taking part in the
competition (compete)
26. .It’s a chance for me to test my general..................................(know)
27. The gap between ......................is bigger and bigger (generational)
28. .One of the problems we have to deal with is water......................(short)