Trên một phương truyền sóng có hai điểm M và N cách nhau 80 cm. Sóng truyền theo

His uncle didn't used to drive to work when he was young.Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in the following question.

The water and land around the chemical factory are serious polluted.Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in the following question.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.One of the most urgent environmental problems in the world today is the shortage of clean water. Having clean...

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.Sociologists have been carrying out research into the social pressures of being a...

The customer's rude behavior towards the waiter was unacceptable.
Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in the following question.

May I wish you every success in your new job.
Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in the following question.

When being interviewed, you should concentrate on what the interviewer is saying or asking.Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in the following question.