I think you should _________ to the doctor. You look terrible. 
A. to go
B. going
C. go
D. went

should + V_inf : nên làm gì
 In many countries, you _________ wear a seat belt in the car - it’s the law. *
A. must
B. should
C. have
D. will

law : luật $→$ must + V_inf : phải làm
 People burn incense to show respect to their.......during Tet. *
A. relatives
B. ancestors
C. friends
D. neighbors

ancestor : tổ tiên
.Correction: (Tìm lỗi sai) You shouldn’t bring a gift when you visit someone’s house. *
A. shouldn’t
B. a
C. visit
D. house

Tạm dịch : Bạn nên mang một món quà khi bạn đến thăm nhà của ai đó.
Correction: (Tìm lỗi sai). Before beginning the meal, we should eating for the oldest person to start. *
A. the
B. eating
C. oldest
D. to

should + V_inf : nên làm gì
.Correction: (Tìm lỗi sai )Vietnamese schools make students wear Ao Dai, the tradition dress of Vietnam. 
Correction: (Tìm lỗi sai)They has to wear that costume because it is the family tradition. *
A. has to
B. that
C. is
D. tradition

they là danh từ số nhiều $→$ they have to wear that costume because it is the family tradition. 
CLOSEST in meaning with ACCEPTED )(Gần nghĩa )* A custom is something that has become an accepted way of doing things. *
A. agreed
B. rejected
C. denied
D. refused

accept : đồng ý = agree : đồng ý
.(CLOSEST in meaning with DISRESPECTFUL )(Gần nghĩa ) People shouldn’t wear short shorts and tank tops. This is disrespectful. *
A. respectful
B. deferential
C. impolite
D. polite

disrespectful : vô lễ = impolite : vô lễ
(OPPOSITE in meaning with TRADITIONAL-Trái nghĩa ). People in some far-away mountainous regions still keep their traditional way of life *
A. modern
B. usual
C. established
D. accepted

traditional : theo truyền thống >< modern : hiện đại
(OPPOSITE in meaning with FINISHED-Trái nghĩa ). When we have finished eating, we place our chopsticks on top of our rice bowl. *
A. ended
B. stopped
C. closed
D. started

finish : kết thúc >< start : bắt đầu

`\color{cyan}{\text{@Bulletproof Boy Scout}}`