Một vật nặng 6kg đặt trên mặt bàn nằm ngang biểu diễn các vectơ lực tác dụng lên vật với tỉ xích tùy chọn.

1.     The first telephone was in commercial___________ by 1877.

A. use                   B. usefully            C. useful           D. useless

2.     They___________ their free time playing video games.

A. take                 B. spend               C. use                   D. have

3.     He was born___________ June 1^st 1789.

A. on          B. in                     C. from                 D. at

4.      Could you help me, please? – ________

A. No problem            B. No. thank you       C. No. I’m fine               D. Yes, please

5.     Unluckily, Stout Nut’s mother was very__________ to Little Pea.

A. excited             B. cruel                 C. upset            D. greedy

6.     Costa Rica sounds___________ a great place for a relaxing vacation.

A. as                     B. same                C. similar               D. like

7.     The Union was________ on March 26 1931 by the beloved President Ho Chi Minh.

A. found               B. fought              C. founded       D. sounded

8.     Grandma used to do everything without _______.

A. electrician              B. electricity       C. electric                       D. electrical

9.     ‘Could you do me a favor?’ – ‘__________’

A. Yes, please.                                  C. No, thanks, I’m fine.

B. Ok. That’s very kind of you.                

 D. Sure. What can I do for you?