Why are you so late? You _______ here two hours ago.

A. must have been

B. would have been

C. should have been 

D. need have been

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

The teacher explained the lesson clearly. However, the students found it hard to understand it.

A. Although the teaching lesson was clear, there was a real challenge to the students

B. Despite the teacher's clear explanation of the lesson, students had difficulty understanding it

C. In spite of explaining the lesson clearly, students themselves found it hard to understand it

D. Though explained clearly, tfifc lesson of teaching was difficult to students

Khi bỏ dấu ngoặc trong biểu thức  m – ( n + d) ta được 

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 each of the following questions.

Our knowledge of malaria has advanced considerably over recent years.

A. held at

B. held back

C. held to

D. held by

Các tỉ số sau đây có lập thành tỉ lệ thức không?

2 1 3 : 7   và   3 1 4 : 13

Điền kí hiệu ∈ hoặc ∉ vào ô trống cho đúng:

a) 36 □ BC(6; 21);

b) 3 □ ƯC(30; 42);

c) 30 □ BC(5; 12; 15);

d) 4 □ ƯC(16; 20; 30)